defrag CONTENT of iso image

ady · **Joined:** Sat May 08, 2010 5:26 am **Posts:** 639

I used Isobuster to search for "missing files and folders" (that's how the function is called in Isobuster) in the iso image of UBCD.

I don't really want to find "missing" files. I just wanted to "order" the content of the iso image.

If I've done the same on a floppy image, I could have "order" the mess with winimage, with the function called "defrag".

But winimage can't do the same with an iso image.

To be clear, I don't want to defrag the iso file itself (I could do it with any file defrag tool if I want to), but the content of the iso image.

Is there any method I can use to defrag the content of an iso image?

TIA.

Icecube · **Joined:** Fri Jan 11, 2008 2:52 pm **Posts:** 1275

Files inside an ISO image are already contiguous (defragmented).
What would be the use of defragging/soritng the content of an ISO image?

There is a -sort parameter for mkisofs:

Quote:

-sort sort file
Sort file locations on the media. Sorting is controlled by a file that contains pairs of filenames and sorting offset weighting. If the weighting is higher, the file will be located closer to the beginning of the media, if the weighting is lower, the file will be located closer to the end of the media. There must be only one space or tabs character between the filename and the weight and the weight must be the last characters on a line. The filename is taken to include all the characters up to, but not including the last space or tab character on a line. This is to allow for space characters to be in, or at the end of a filename. This option does not sort the order of the file names that appear in the ISO9660 directory. It sorts the order in which the file data is written to the CD image - which may be useful in order to optimize the data layout on a CD. See README.sort for more details.

http://linux.die.net/man/8/mkisofs

ady · **Joined:** Sat May 08, 2010 5:26 am **Posts:** 639

Icecube wrote:

Files inside an ISO image are already contiguous (defragmented).
What would be the use of defragging/soritng the content of an ISO image?

Icecube, I'll try to explain myself better. I'll do it with a comparison between floppy images and iso images.

Suppose you have a clean new floppy, you save some files on it, and you make an image from it. Since you haven't deleted any file from the floppy, the image you have is defragmented. By this, I mean:
a) all the files are saved in the beggining of the data area;
b) the rest of the data area is "clean" (no files)
c) the files are saved in continuous, sorted manner (not fragmented, not unsorted)
d) the FAT area is also "sorted".

If you open this floppy image with Isobuster, and run the "search for missing files and folders" function, you won't find any files/folders "missing". Or alternatively, an undelete program won't find anything.

After some time, you use the floppy again and again, saving, deleting... Now, a new floppy image will show "missing files/folders" (using the term of Isobuster), and the content of this new floppy image can be "resorted" by winimage, using the "defrag" function in it.

The *.ima/*.img file could be defragmented or not in your hard disk. Winimage doesn't care. But until using winimage to "defrag" the contents of the floppy image, those contents are sector-by-sector a copy of the fragmented floppy.

Now, instead of using a floppy, and a floppy image, change the previous paragraphs to a CD-RW and an iso image of it. Winimage can't "defrag" this type of image (the content of it, to be more specific).

If you have Isobuster (or similar alternative software), you can check this "missing" files function on the original UBCD503.iso image. It takes just a few minutes at most, probably less than 2 minutes. And if you try to use the "defrag" function of winimage on this iso image, you will see that it isn't available for it.

Maybe I was more clear now in my explanation. If I wasn't, please ask whatever info you need and I'll do my best to communicate it in a clear manner.

TIA.

Icecube · **Joined:** Fri Jan 11, 2008 2:52 pm **Posts:** 1275

You should NEVER edit an iso with an ISO editor.
If you want to add a file to a bootable ISO, you need to create it from scratch again (with mkisofs).

Floppy images and ISO images aren't comparable. Floppy images use the FAT12 filesystem (at least most of the time) and is meant to be read and written too (and may need defragmenting), ISO images use the iso9660 filesystem (or UDF) which is a read only filesystem and isn't intended to be edited afterwards (and because you can't or shouldn't write to it, you don't need to defragment it)..

ady · **Joined:** Sat May 08, 2010 5:26 am **Posts:** 639

It seems I failed to be clear once again. My apologies.

Let's say you have a CD-RW.

You write (burn) on it, for example, UBCD 5.00.

Then, you want to change it, and instead of UBCD 5.00, you write UBCD 5.01.

On a normal CD-R, you couldn't do it, but this is a CD-RW. Now, you should erase it first, before burning the new data. This is the recommended method.

But let's suppose you don't erase the CD-RW, but burn on it the new data.

Now you want to test new features, customize it, fix bugs, for the release of the next version. You burn again and again.

At some point, part of the surface of the CD-RW is not going to work correctly, but you keep using the same media.

If you want to distribute this CD-RW, you make an iso image. Everyone who download this image, has exactly the same sector-by-sector information that you have in your master CD-RW.

I want to get rid of those sectors that are unusable, or that have old data from the previous burns. I don't want those sectors to get to a new CD burned from that iso.

So, what winimage was doing by means of its "defrag" function over a floppy image content, was actually "cleaning" the mess. Not only the files got defragmented, but the last sectors were "cleaned". Those sectors, instead of containing deleted data, now contain "F6" (in FAT12 floppies), until you get to the last final sector, where you get "00". (For those interested in looking at this, use an Hex editor like HxD over a "dirty" floppy image, comparing the image before and after winimage "defrag").

So I guess that what I meant was, not so much to align (defrag) the currently existing files/folders inside an iso image, but to get rid of the "old" data.

Maybe, the "missing files and folders" that Isobuster finds, are not actually from the iso image, but from my own hard disk, where those files are saved. I don't know.

By using Isobuster, opening the original UBCD503.iso image, and applying the "search missing files and folders" function, you can see an example of what I am writing about. But, maybe it is just happening in my system, and in yours everything looks fine. I'll appreciate if you can check it.

I don't have the intention of "editing" the iso image. I want to get rid of those old fragments. If there is a method to accomplish that, probably it requires expanding the content of the iso image, applying some function to it, and re-building the iso image once again. It may be possible that the order of this procedure is not as I describe here. I don't know, and that's why I am asking.

I am interested in the method and the tools necessary to accomplish the goal. Probably it requires more than one tool. I only used the winimage+floppy image comparison to explain the goal, not the method.

Now that I explained the goal, maybe someone knows a method to accomplish it.

TIA.

Icecube · **Joined:** Fri Jan 11, 2008 2:52 pm **Posts:** 1275

ady wrote:

On a normal CD-R, you couldn't do it, but this is a CD-RW. Now, you should erase it first, before burning the new data. This is the recommended method.

But let's suppose you don't erase the CD-RW, but burn on it the new data.

I have never seen a program that could burn a new ISO image over a CD-RW that already had files on it, without erasing the CD-RW first. I don't know why it isn't supported. If you find a program that is able to do it, tell me. I am interested.

ady wrote:

Now you want to test new features, customize it, fix bugs, for the release of the next version. You burn again and again.

Use virtual machine software (VirtualBox, qemu, kvm, VMware, ...) for testing ISO's. It makes it easy to test most things.

ady wrote:

At some point, part of the surface of the CD-RW is not going to work correctly, but you keep using the same media.

If you want to distribute this CD-RW, you make an iso image. Everyone who download this image, has exactly the same sector-by-sector information that you have in your master CD-RW.

You should keep the original ISO file and distribute that and not an image that you make of the already burned CD-RW. The ISO image is always clean.

ady wrote:

By using Isobuster, opening the original UBCD503.iso image, and applying the "search missing files and folders" function, you can see an example of what I am writing about. But, maybe it is just happening in my system, and in yours everything looks fine. I'll appreciate if you can check it.

I don't have ISO buster here atm, so I can't check right now.

ady · **Joined:** Sat May 08, 2010 5:26 am **Posts:** 639

Icecube wrote:

I have never seen a program that could burn a new ISO image over a CD-RW that already had files on it, without erasing the CD-RW first. I don't know why it isn't supported. If you find a program that is able to do it, tell me. I am interested.

There is such a thing called floppy or hard disk "quick format", as opposed to "full" or "complete" format.

For CD's, there is "quick erase" or "quick blanking". It is basically the same: erase the info that points to the actual blocks of data, instead of deleting the actual data.

From http://en.wikipedia.org/wiki/CD-RW :

Quote:

Different blanking methods can be used, including "full" blanking in which the entire surface of the disc is cleared, and "fast" blanking in which only meta-data areas are cleared

The "quick blanking" method means there could be "old" data previously burned, that could be found by the "find missing files and folders function" of Isobuster.

Additionally, there is "packet writing" software, which treats a CD-RW as if it were a floppy (with pros and cons). The most known of such software for windows platform is InCD ( http://en.wikipedia.org/wiki/InCD ).

Most good burning software will have an option to "erase" the CD-RW before writing over it. In general, this means "full erase" instead of "quick erase". We are talking about a new complete burning session, not a multisession CD. For a multisession to exist, you would need to preserve the previous session, avoiding the "full erase" of the actual data area.

Quote:

Use virtual machine software (VirtualBox, qemu, kvm, VMware, ...) for testing ISO's. It makes it easy to test most things.

Yes, I use Mobalivecd (uses kqemu, portable) to test UBCD. But I was trying to explain myself with an example. I don't actually burn again and again the same CD.

Quote:

You should keep the original ISO file and distribute that and not an image that you make of the already burned CD-RW. The ISO image is always clean.

Again, it was just an example to explain myself. I think my problem to explain the goal is that I used the terms of Isobuster and Winimage.

Please concentrate at the "cleaning the mess" part, instead of thinking about a traditional defrag.

Quote:

I don't have ISO buster here atm, so I can't check right now.

Well, it seems I will have to wait for someone who tries the "find missing files and folders" of Isobuster over the original UBCD503.iso, since, apparently, experimenting with that function for a few minutes is going to explain my goal better than my words here. (The point being: the original ubcd503.iso in my system does not seem to be "clear/clean")

Icecube, if you can, please just try "find missing files and folders" of Isobuster over the original UBCD503.iso and maybe you will see what I see in my system. Running the function over the iso image should take a couple of minutes at most, assuming you already have Isobuster installed in some system or VM.

TIA.

Icecube · **Joined:** Fri Jan 11, 2008 2:52 pm **Posts:** 1275

I know about the quick erase function and the packet writing software. I only don't know a program that can write to the start of the CD-RW (burn new ISO image) without doing a quick erase first.

The missing files ISObuster found are not left over files inside the ISO image.
Some are real files that are used on UBCD: like the 28.227.584 gzip archive, which is in reality the /ubcd/boot/discwiz/initrd.img file (size: 27.627.228 bytes)

Some files are not even valid files: a png image of 125.646.848 bytes is very unlikely to exist inside a ISO file of 315.994.112 bytes.

In theory it can also list files that are inside a floppy image file which is included in the iso. This will be very unlikely in this case, because all floppy images are compressed with gzip.

When looking at the iso with photorec and searching for files:

Code:

28227584 2008-10-29 03:08 f0448356_initrd.img.gz
25761792 2009-09-14 10:23 f0351344_initrd.gz
19132416 2007-08-08 15:57 f0410988_ramdisk.dat.initrd.gz
10485760 2010-09-19 02:38 f0000692.elf
 5636096 2007-04-30 00:49 f0527420_dban-beta.2007042900_i386.iso.gz
 4288512 2010-03-23 06:01 f0556680_g4u.iso.gz
 3307520 2008-08-02 01:59 f0579212_offntpassw-cd080802.iso.gz
 3244032 2009-03-03 21:46 f0404652_initrd.gz
 2676736 2010-08-23 08:52 f0551452_fdubcd.img.gz
 2674688 2010-04-26 15:49 f0591096_seatool2.img.gz
 1445888 2004-07-29 05:10 f0540172_discwiz.img.gz
 1386496 2006-10-03 02:38 f0524712_xxx.img.gz
 1378304 2010-05-21 11:06 f0567872_hdclone.img.gz
 1368064 2009-04-22 16:29 f0597600_ssdm.img.gz
 1363968 2005-04-14 04:41 f0574760_maxblast.img.gz
 1244606 2010-09-19 02:39 f0518624.cab
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    4530 2010-09-19 02:39 f0614960.gif
    4329 2010-09-19 02:39 f0601584.sh
    4211 2010-09-19 02:39 f0601596.sh
    3829 2010-09-19 02:39 f0601608.sh
    3820 2010-09-19 02:39 f0601652.sh
    3808 2010-09-19 02:39 f0522184.cab
    3802 2010-09-19 02:39 f0615108.gif
    3600 2010-09-19 02:39 f0615092.gif
    3549 2010-09-19 02:39 f0614924.gif
    3538 2010-09-19 02:39 f0401932.gif
    3413 2010-09-19 02:39 f0615116.gif
    3262 2010-09-19 02:38 f0351328.ico
    3262 2010-09-19 02:39 f0613820.ico
    3136 2010-09-19 02:39 f0614724.gif
    2861 2010-09-19 02:39 f0602060.bat
    2722 2010-09-19 02:39 f0614704.gif
    2426 2010-09-19 02:39 f0615084.gif
    2258 2010-09-19 02:39 f0614744.jpg
    2211 2010-09-19 02:39 f0601996.bat
    1753 2010-09-19 02:39 f0615104.jpg
    1410 2010-09-19 02:39 f0613412.txt
    1299 2010-09-19 02:39 f0401844.gif
    1273 2010-09-19 02:39 f0613420.h
    1148 2010-09-19 02:39 f0615100.gif
    1060 2010-09-19 02:39 f0601648.txt
    1034 2010-09-19 02:39 f0614736.gif
    1003 2010-09-19 02:39 f0616188.jpg
     979 2010-09-19 02:39 f0614700.txt
     961 2010-09-19 02:39 f0401836.gif
     928 2010-09-19 02:39 f0601616.txt
     925 2010-09-19 02:39 f0402076.gif
     857 2010-09-19 02:39 f0614908.gif
     802 2010-09-19 02:39 f0613416.txt
     738 2010-09-19 02:39 f0602068.txt
     614 2010-09-19 02:39 f0614740.gif
     613 2010-09-19 02:39 f0614932.gif
     400 2010-09-19 02:39 f0615080.gif
     152 2010-09-19 02:39 f0614732.gif
     137 2010-09-19 02:39 f0601740.bat
     131 2010-09-19 02:39 f0402108.gif
     127 2010-09-19 02:39 f0601732.bat
     126 2010-09-19 02:39 f0601728.bat
     126 2010-09-19 02:39 f0601736.bat
     112 2010-09-19 02:39 f0614936.gif
      81 2010-09-19 02:39 f0402000.gif

You can see that a lot of files (look at the filesize) are similar to the WinImage output.
Also look at the timestamp.

Here you can see the output of the isoinfo command (from the same package as the mkisofs program):

Code:

Directory listing of /
d---------   0    0    0            2048 Jul  9 2010 [     30 02]  . 
d---------   0    0    0            2048 Jul  9 2010 [     30 02]  .. 
d---------   0    0    0            2048 Aug 25 2010 [     31 02]  antivir 
----------   0    0    0              69 Aug 18 2008 [    170 00]  autorun.inf 
d---------   0    0    0            2048 Jul  9 2010 [     33 02]  boot 
----------   0    0    0            3158 Apr 18 2008 [    171 00]  license.txt 
d---------   0    0    0            2048 Jul  9 2010 [     37 02]  pmagic 
d---------   0    0    0            2048 Jul  9 2010 [     43 02]  ubcd 

Directory listing of /antivir/
d---------   0    0    0            2048 Aug 25 2010 [     31 02]  . 
d---------   0    0    0            2048 Jul  9 2010 [     30 02]  .. 
d---------   0    0    0            2048 Aug 25 2010 [     32 02]  .storage 
----------   0    0    0         9607680 Aug 25 2010 [    173 00]  antivir 
----------   0    0    0             189 Aug 25 2010 [   4865 00]  antivir.asc 
----------   0    0    0        19875328 Aug 25 2010 [   4866 00]  antivir0.vdf 
----------   0    0    0        16733040 Aug 25 2010 [  14571 00]  antivir1.vdf 
----------   0    0    0         2400160 Aug 25 2010 [  22742 00]  antivir2.vdf 
----------   0    0    0          112640 Aug 25 2010 [  23914 00]  antivir3.vdf 

Directory listing of /boot/
d---------   0    0    0            2048 Jul  9 2010 [     33 02]  . 
d---------   0    0    0            2048 Jul  9 2010 [     30 02]  .. 
d---------   0    0    0            2048 Jul  9 2010 [     34 02]  grub 
d---------   0    0    0            2048 Jul  9 2010 [     35 02]  isolinux 
d---------   0    0    0            2048 Jul  9 2010 [     36 02]  syslinux 

Directory listing of /pmagic/
d---------   0    0    0            2048 Jul  9 2010 [     37 02]  . 
d---------   0    0    0            2048 Jul  9 2010 [     30 02]  .. 
d---------   0    0    0            2048 Jul  9 2010 [     38 02]  boot 
----------   0    0    0         4462144 Apr  4 2010 [  24225 00]  bzImage 
----------   0    0    0          130681 Apr 11 2010 [  26404 00]  initramfs 
d---------   0    0    0            2048 Aug 25 2010 [     42 02]  pmodules 

Directory listing of /ubcd/
d---------   0    0    0            2048 Jul  9 2010 [     43 02]  . 
d---------   0    0    0            2048 Jul  9 2010 [     30 02]  .. 
d---------   0    0    0            2048 Jul  9 2010 [     44 02]  boot 
d---------   0    0    0            2048 Aug 24 2010 [     59 02]  custom 
d---------   0    0    0            8192 Aug 24 2010 [     60 02]  dosapps 
d---------   0    0    0            6144 Aug 23 2010 [     64 02]  images 
d---------   0    0    0            2048 Jul  9 2010 [     67 02]  menus 
d---------   0    0    0            2048 Jul  9 2010 [     73 02]  tools 
----------   0    0    0            3262 Mar 16 2010 [  87832 00]  ubcd.ico 
d---------   0    0    0            4096 Jul  9 2010 [     88 02]  website 

Directory listing of /antivir/.storage/
d---------   0    0    0            2048 Aug 25 2010 [     32 02]  . 
d---------   0    0    0            2048 Aug 25 2010 [     31 02]  .. 
----------   0    0    0           16384 Aug 25 2010 [  23969 00]  storage.db 

Directory listing of /boot/grub/
d---------   0    0    0            2048 Jul  9 2010 [     34 02]  . 
d---------   0    0    0            2048 Jul  9 2010 [     33 02]  .. 
----------   0    0    0          220921 Oct 16 2009 [  23977 00]  grldr 
----------   0    0    0              42 Jul 27 2009 [  24085 00]  menu.lst 

Directory listing of /boot/isolinux/
d---------   0    0    0            2048 Jul  9 2010 [     35 02]  . 
d---------   0    0    0            2048 Jul  9 2010 [     33 02]  .. 
----------   0    0    0           14336 Aug 25 2010 [    163 00]  isolinux.bin 
----------   0    0    0              97 Jul  8 2009 [  24086 00]  isolinux.cfg 

Directory listing of /boot/syslinux/
d---------   0    0    0            2048 Jul  9 2010 [     36 02]  . 
d---------   0    0    0            2048 Jul  9 2010 [     33 02]  .. 
----------   0    0    0           14884 Apr  1 2010 [  24087 00]  chain.c32 
----------   0    0    0            5384 Apr 18 2010 [  24095 00]  econfig.c32 
----------   0    0    0           15218 Apr  1 2010 [  24098 00]  ldlinux.sys 
----------   0    0    0           25244 Jul 21 2010 [  24106 00]  memdisk 
----------   0    0    0           54964 Apr  1 2010 [  24119 00]  menu.c32 
----------   0    0    0             776 Oct  6 2009 [  24146 00]  reboot.c32 
----------   0    0    0              97 Jul  8 2009 [  24147 00]  syslinux.cfg 
----------   0    0    0          156944 Oct  6 2009 [  24148 00]  vesamenu.c32 

Directory listing of /pmagic/boot/
d---------   0    0    0            2048 Jul  9 2010 [     38 02]  . 
d---------   0    0    0            2048 Jul  9 2010 [     37 02]  .. 
d---------   0    0    0            2048 Aug 23 2010 [     39 02]  grub4dos 
d---------   0    0    0            2048 Aug 23 2010 [     40 02]  isolinux 
d---------   0    0    0            2048 Aug 23 2010 [     41 02]  syslinux 

Directory listing of /pmagic/pmodules/
d---------   0    0    0            2048 Aug 25 2010 [     42 02]  . 
d---------   0    0    0            2048 Jul  9 2010 [     37 02]  .. 
----------   0    0    0        25579804 Aug 25 2010 [  26543 00]  clamav-definitions.txz 
----------   0    0    0          891928 Nov  2 2009 [  39034 00]  f-prot-6.0.2.txz 
----------   0    0    0        19108120 May 12 2010 [  39470 00]  fprot-definitions.txz 
----------   0    0    0          671596 Oct 13 2009 [  48801 00]  pccmoscleaner.txz 
----------   0    0    0          236332 Oct 13 2009 [  49129 00]  pcdiskeraser.txz 
----------   0    0    0          789576 Oct 13 2009 [  49245 00]  pcloginnow.txz 
----------   0    0    0         1603132 Oct 13 2009 [  49631 00]  pcregedit.txz 
----------   0    0    0        76562432 Apr 11 2010 [  50414 00]  pmagic-4.10.sqfs 
----------   0    0    0           67980 Nov  2 2009 [  87798 00]  xfprot-2.2.txz 

Directory listing of /ubcd/boot/
d---------   0    0    0            2048 Jul  9 2010 [     44 02]  . 
d---------   0    0    0            2048 Jul  9 2010 [     43 02]  .. 
d---------   0    0    0            2048 Aug 25 2010 [     45 02]  antivir 
d---------   0    0    0            2048 Jul  9 2010 [     50 02]  bko 
d---------   0    0    0            2048 Jul  9 2010 [     51 02]  cpustress 
d---------   0    0    0            2048 Jul  9 2010 [     53 02]  discwiz 
d---------   0    0    0            2048 Jul  9 2010 [     54 02]  diskcopy 
d---------   0    0    0            2048 Jul  9 2010 [     55 02]  memtest86 
d---------   0    0    0            2048 Jul  9 2010 [     56 02]  memtest86p 
d---------   0    0    0            2048 Jul  9 2010 [     57 02]  netbootme 
d---------   0    0    0            2048 Jul  9 2010 [     58 02]  x86test 

Directory listing of /ubcd/custom/
d---------   0    0    0            2048 Aug 24 2010 [     59 02]  . 
d---------   0    0    0            2048 Jul  9 2010 [     43 02]  .. 
----------   0    0    0             514 Aug 24 2010 [ 125869 00]  custom.cfg 
----------   0    0    0              16 May 11 2010 [ 125870 00]  custom.ini 
----------   0    0    0             447 Aug 24 2010 [ 125871 00]  custom.lst 

Directory listing of /ubcd/dosapps/
d---------   0    0    0            8192 Aug 24 2010 [     60 02]  . 
d---------   0    0    0            2048 Jul  9 2010 [     43 02]  .. 
----------   0    0    0          512537 Dec 28 2008 [ 125872 00]  aida16.cab 
----------   0    0    0           79434 Aug  8 2008 [ 126123 00]  amset.cab 
----------   0    0    0          884730 Mar 23 2010 [ 126162 00]  astra.cab 
----------   0    0    0            8254 Aug 31 2008 [ 126594 00]  ata24.cab 
----------   0    0    0            8210 Aug 31 2008 [ 126599 00]  ata245.cab 
----------   0    0    0           67198 Aug  8 2008 [ 126604 00]  atainf.cab 
----------   0    0    0           45500 Aug  8 2008 [ 126637 00]  atapicd.cab 
----------   0    0    0           20316 Aug  8 2008 [ 126660 00]  atapwd.cab 
----------   0    0    0           30123 May 10 2010 [ 126670 00]  bios.cab 
----------   0    0    0           24539 Aug  8 2008 [ 126685 00]  bootpart.cab 
----------   0    0    0          247988 Aug  8 2008 [ 126697 00]  bughunt.cab 
----------   0    0    0          130154 Aug  8 2008 [ 126819 00]  cdindex.cab 
----------   0    0    0           70800 Aug 31 2008 [ 126883 00]  chgdef2.cab 
----------   0    0    0           59230 Aug  8 2008 [ 126918 00]  cmospwd.cab 
----------   0    0    0           20058 Aug  8 2008 [ 126947 00]  cpm.cab 
----------   0    0    0           55664 Aug  8 2008 [ 126957 00]  diskedit.cab 
----------   0    0    0           21148 Aug 31 2008 [ 126985 00]  diskinfo.cab 
----------   0    0    0           96393 Aug  8 2008 [ 126996 00]  diskman4.cab 
----------   0    0    0          195518 Aug  8 2008 [ 127044 00]  dlgdiag4.cab 
----------   0    0    0          267075 Aug  8 2008 [ 127140 00]  dlgdiag5.cab 
----------   0    0    0           76010 Aug  8 2008 [ 127271 00]  editbini.cab 
----------   0    0    0           47818 Mar 19 2010 [ 127309 00]  esfeat.cab 
----------   0    0    0           54143 Aug  8 2008 [ 127333 00]  estest.cab 
----------   0    0    0          675073 Oct  9 2009 [ 127360 00]  estool.cab 
----------   0    0    0           44774 Mar 23 2010 [ 127690 00]  fdisk.cab 
----------   0    0    0           88381 Aug  8 2008 [ 127712 00]  filelink.cab 
----------   0    0    0          123032 Aug  8 2008 [ 127756 00]  fips.cab 
----------   0    0    0           58659 Aug 17 2008 [ 127817 00]  fjdt.cab 
----------   0    0    0           30628 Jun  6 2010 [ 127846 00]  fjerase.cab 
----------   0    0    0           98786 Aug  8 2008 [ 127861 00]  gwscn315.cab 
----------   0    0    0          262352 Aug  8 2008 [ 127910 00]  gwscn512.cab 
----------   0    0    0           80645 Oct  7 2009 [ 128039 00]  hdderase.cab 
----------   0    0    0          142523 Aug  8 2008 [ 128079 00]  hutil1.cab 
----------   0    0    0          532733 Aug  8 2008 [ 128149 00]  hutil2.cab 
----------   0    0    0           39923 Aug  8 2008 [ 128410 00]  intelfid.cab 
----------   0    0    0           77831 Mar 14 2010 [ 128430 00]  intelpiu.cab 
----------   0    0    0            4834 Aug 17 2008 [ 128469 00]  keydisk.cab 
----------   0    0    0         1139162 May 23 2010 [ 128472 00]  killdisk.cab 
----------   0    0    0           32324 Aug  8 2008 [ 129029 00]  maxllf.cab 
----------   0    0    0           46209 Aug  8 2008 [ 129045 00]  mbrtool.cab 
----------   0    0    0           14973 Aug  8 2008 [ 129068 00]  mbrwork.cab 
----------   0    0    0          496730 Oct  9 2009 [ 129076 00]  nssi.cab 
----------   0    0    0           68720 Aug  8 2008 [ 129319 00]  parallel.cab 
----------   0    0    0          248687 Aug  8 2008 [ 129353 00]  pcconfig.cab 
----------   0    0    0          214358 Oct  4 2008 [ 129475 00]  pci.cab 
----------   0    0    0           95171 Aug  8 2008 [ 129580 00]  presizer.cab 
----------   0    0    0           59097 Aug  8 2008 [ 129627 00]  ranish.cab 
----------   0    0    0         1244606 Mar 23 2010 [ 129656 00]  savepart.cab 
----------   0    0    0           39562 Aug  8 2008 [ 130264 00]  scsimax.cab 
----------   0    0    0           66677 Aug  8 2008 [ 130284 00]  shdiag.cab 
----------   0    0    0           36088 Aug  8 2008 [ 130317 00]  smartudm.cab 
----------   0    0    0          107176 Aug  8 2008 [ 130335 00]  spfdisk.cab 
----------   0    0    0          112055 Mar 14 2010 [ 130388 00]  sst.cab 
----------   0    0    0           41768 Aug  8 2008 [ 130443 00]  sutil.cab 
----------   0    0    0          104710 Aug  8 2008 [ 130464 00]  uata100.cab 
----------   0    0    0            5144 Aug 24 2010 [ 130516 00]  ubcd.ini 
----------   0    0    0           54057 Mar 23 2010 [ 130519 00]  vivard.cab 
----------   0    0    0            3808 Aug  8 2008 [ 130546 00]  wipecmos.cab 
----------   0    0    0           46064 Aug  8 2008 [ 130548 00]  xbios.cab 
----------   0    0    0           38239 Aug  8 2008 [ 130571 00]  xfdisk.cab 
----------   0    0    0          219866 Aug  8 2008 [ 130590 00]  xosl.cab 

Directory listing of /ubcd/images/
d---------   0    0    0            6144 Aug 23 2010 [     64 02]  . 
d---------   0    0    0            2048 Jul  9 2010 [     43 02]  .. 
----------   0    0    0          634258 Apr 24 2008 [ 130698 00]  clonemax.img.gz 
----------   0    0    0          347612 Jun 21 2008 [ 131008 00]  copywipe.img.gz 
----------   0    0    0         1385102 Oct  3 2006 [ 131178 00]  datalife.img.gz 
----------   0    0    0         5635907 Jul 16 2009 [ 131855 00]  dban.iso.gz 
----------   0    0    0          892527 Mar 23 2010 [ 134607 00]  dft.img.gz 
----------   0    0    0         1444790 Jul 28 2004 [ 135043 00]  discwiz.img.gz 
----------   0    0    0          957965 Mar 23 2010 [ 135749 00]  diskcheck.img.gz 
----------   0    0    0          816832 Nov 22 2007 [ 136217 00]  diskcheck.pdf 
----------   0    0    0          785528 Jul 28 2004 [ 136616 00]  diskmgr.img.gz 
----------   0    0    0           62876 Aug 17 2008 [ 137000 00]  diskspy.img.gz 
----------   0    0    0          651523 May 17 2004 [ 137031 00]  diskspy.pdf 
----------   0    0    0          243176 Jul 28 2004 [ 137350 00]  dlgudma.img.gz 
----------   0    0    0          208901 Jan 18 2007 [ 137469 00]  docmem.img.gz 
----------   0    0    0          594437 Sep 20 2006 [ 137572 00]  emaxx.img.gz 
----------   0    0    0         2675782 Aug 23 2010 [ 137863 00]  fdubcd.img.gz 
----------   0    0    0         4287391 Mar 23 2010 [ 139170 00]  g4u.iso.gz 
----------   0    0    0          261650 Aug 29 2008 [ 141264 00]  gag.img.gz 
----------   0    0    0          138854 Mar 19 2010 [ 141392 00]  gujin.img.gz 
----------   0    0    0         1038610 Mar 23 2010 [ 141460 00]  hdat2.img.gz 
----------   0    0    0         1376905 May 23 2010 [ 141968 00]  hdclone.img.gz 
----------   0    0    0         1226200 May 12 2010 [ 142641 00]  hdclone.pdf 
----------   0    0    0          501206 Mar 19 2010 [ 143240 00]  hdt.img.gz 
----------   0    0    0          417851 Jun  6 2010 [ 143485 00]  ibmft.img.gz 
----------   0    0    0         1362157 Apr 15 2005 [ 143690 00]  maxblast.img.gz 
----------   0    0    0          453323 May  7 2008 [ 144356 00]  mhdd45.img.gz 
----------   0    0    0          459534 Aug 27 2005 [ 144578 00]  mhdd46.img.gz 
----------   0    0    0         3305473 Jul 16 2009 [ 144803 00]  offntpassw.iso.gz 
----------   0    0    0          256516 Sep 30 2006 [ 146418 00]  pcisniffer.img.gz 
----------   0    0    0           78472 May  9 2010 [ 146544 00]  plopbt.img.gz 
----------   0    0    0          365917 Apr 21 2005 [ 146583 00]  powmx409.img.gz 
----------   0    0    0          650010 Jun 15 2008 [ 146762 00]  powmx423.img.gz 
----------   0    0    0          168009 Aug 17 2004 [ 147080 00]  ptsdedit.img.gz 
----------   0    0    0           17391 Oct  6 2004 [ 147163 00]  sbm.img.gz 
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Look at the column after the date. It is the LBA address (sector at with the file starts) of the file on the disk and compare it with the output of ISObuster.

The filesize won't always match between ISObuster, photorec and isoinfo, because when searching for missing files, ISObuster and photorec will pad the files so their size is a multiple of 2048 (CD sector size), unles they can reliable determine where a file stops.

ady · **Joined:** Sat May 08, 2010 5:26 am **Posts:** 639

Quote:

...without doing a quick erase first...

The point is that when you use quick erase, you are only erasing the info that points to the actual data, similar to the "delete" or "format /q" commands of FAT. That is how the "undelete" and "data recovery" programs work.

That is why I still think that when using a CD-RW, it is possible to leave info in the data area that is not really part of the last burn session.

When burning ubcd (about 300MB, less than half of the whole capacity), the laser is not going to touch the last half of the surface. If there were previous sessions covering more than 300MB, then the data area is not completely "clean", unless you make a "full erase", instead of a quick erase.

How these "dirty" sectors are getting into the 300MB iso image? I still don't know.

Quote:

The missing files ISObuster found are not left over files inside the ISO image.

So you are saying there are no "dirty" sectors in the iso image? None at all?

If that's true, then I still don't understand why Isobuster would "mark" part of those "missing files and folders" as "bad sectors".

With "bad sectors", I mean those files that are marked in Isobuster with a specific icon: a big red "X".

Not only those files are "missing" (in terms of Isobuster), but are marked as files (at least partially) burned in physical "bad" sectors.

When I used complete 1440K floppy images, I found "missing files", and using winimage's "defrag" function, the "dirty" sectors of the image were gone.

But the ubcd503.iso image is not a "complete" image (meaning an image of every physical sector of the CD) as the 1440K floppy image.

So I am still confused about how to differentiate actual "dirty" info/sectors from "errors" of the Isobuster algorithm that make it understand that data as "missing files and folders", specially those marked as "bad sectors".

Icecube · **Joined:** Fri Jan 11, 2008 2:52 pm **Posts:** 1275

ady wrote:

Quote:

The missing files ISObuster found are not left over files inside the ISO image.

So you are saying there are no "dirty" sectors in the iso image? None at all?.

Yes. The ISO image is created by mkisofs from scratch (takes files from a directory and puts them in an ISO image). It is a process that you could compare with creating a new zip archive. The ISO image isn't a copy of a burned CD-R(W).

ady wrote:

When I used complete 1440K floppy images, I found "missing files", and using winimage's "defrag" function, the "dirty" sectors of the image were gone.

Floppy images are different. The normally use FAT12 as filesystem. Floppy images are readable and writable while ISO images are only readable (once created no extra info is ever written at it). Most of the time, floppy images aren't created from scratch. So leftover files can exists when someone deletes files or when a file is updated but the newer file is smaller than the old one, so you still can retrieve part of the old file.

ady wrote:

So I am still confused about how to differentiate actual "dirty" info/sectors from "errors" of the Isobuster algorithm that make it understand that data as "missing files and folders", specially those marked as "bad sectors".

ISObuster finds files by looking for file signatures (magic bytes) in all sectors:
http://www.garykessler.net/library/file_sigs.html
You will see that some files that are in the ISO image aren't detected by ISObuster because it doesn't has a file signature for that file type (e.g.: .c32 modules).
ISObuster tries to find all files only with the file signature without looking at the iso9660 filesystem itself. So in case you have a bad CD-R(W) you can still retrieve some files even if the iso9660 filesystem itself is damaged.

You can confirm that ISObuster finds files that are real files (that are normally visable in the ISO), by comparing the LBA offset column for all found files with the green part of the isoinfo output I posted.

Code:

----------   0    0    0         4287391 Mar 23 2010 [ 139170 00]  g4u.iso.gz

Quote:

---------- 0 0 0 4287391 Mar 23 2010 [ 139170 00] g4u.iso.gz

ady · **Joined:** Sat May 08, 2010 5:26 am **Posts:** 639

Icecube, thank you for your time and help.

As I said before, I understand the differences between a FAT12 complete floppy image and an iso image.

Quote:

ISObuster finds files by looking for file signatures (magic bytes) in all sectors

In my system, not all the found files are found by their file signatures. I see an additional list of files as part of a FAT section on the left panel. I wonder if this list is particular to my system, or everyone can see it after running "find missing files and folders" function of Isobuster.

(In my system) The first part of the list is:

Code:

LBA        , DATE       TIME     , SIZE      , PATHandFILENAME
43889363   , 1980-02-22 17:17:28 , 0.50 KB   , >:\Ü€_uö.d
128131412  , 2031-01-14 00:30:00 , 0.50 KB   , >:\€üu_.ö.È€
361688916  , 2003-05-30 14:40:00 , 0.50 KB   , >:\ff…Àu..f‹f
488664499  , 2015-07-22 05:49:34 , 0.50 KB   , >:\öÄ_…ˆ.€ü
1059098045 , 2031-01-15 14:42:06 , 0.50 KB   , >:\¼€üu
ƒ.ùu
00000000   , 1980-01-01 00:00:00 , 0.00 KB   , >:\.ÿ.¸f.

After that, the following files on the list are marked as "bad sectors" in Isobuster:

Code:

LBA        , DATE       TIME     , SIZE      , PATHandFILENAME
05214399   , 2049-09-14 05:03:46 , 488.89 MB , >:\÷f.÷f
15687335   , 2003-04-11 12:49:28 , 3.31 GB   , >:\.ÿ6à.f.‹6Ì
68289170   , 1601-01-01 00:00:00 , 1.10 GB   , >:\wjér_.f‹.ff
193232765  , 1601-01-01 00:00:00 , 736.23 MB , >:\Ís.€à.ë
244050253  , 2037-01-01 00:24:44 , 404.32 MB , >:\.÷f..Šv
558112451  , 2103-09-14 00:22:48 , 599.27 MB , >:\€ud.fƒ~.
906763645  , 1601-01-01 00:00:00 , 2.45 GB   , >:\fd„..Šv
942970297  , 1601-01-01 00:00:00 , 1.01 GB   , >:\ŽØŠu.ö.È
1059086320 , 2044-01-22 14:34:04 , 3.00 GB   , >:\.ÿ6àrs..öf

Of course, the particular information of those lists doesn't make any sense.

In this context, the important thing is: I don't see those LBA numbers (or a similar range) as part of the regular files included in the ubcd503.iso in Isobuster.

So:

a ) Are you seeing the same FAT section found by the "find missing files and folders" function of Isobuster? Or only the files found by their signatures?

b ) Even using an algorithm, I can't see why Isobuster marks those blocks as "bad sectors". Moreover, those sectors are far away of the common LBA numbers I find on the "normal" files. Are you also seeing this "bad sectors" in your system? Or is it my particular system?

c ) Does Isobuster and Isoinfo are posting different information about LBA numbers? They should be the same numbers, shouldn't they?

TIA.

Icecube · **Joined:** Fri Jan 11, 2008 2:52 pm **Posts:** 1275

I see the same strange file in the FAT subsection.

ISObuster just shows bogus information. I don't know why you make such a large problem of it.
You have to ask the ISObuster people, why they show such info. AFAI understand ISObuster can help you so retrieve files from bad CDs. They probably rather want to show some false-positives than don't showing them and missing some files that are really there.

ady · **Joined:** Sat May 08, 2010 5:26 am **Posts:** 639

Icecube, thank you very much for your time and answers. I really appreciate it.

Icecube wrote:

I see the same strange file in the FAT subsection.

That would suggest that is not a problem of my particular system.

Quote:

ISObuster just shows bogus information.

It just surprises me that Isobuster is showing "bad sectors" from the original iso image. I understand why the list of files/folders found by their signatures are false positives, but the "bad sectors" surprises me.
I wonder if other recovery software, like CDmage, ICE ECC recovery, DVDisaster or many others also shows this same list of "bad sectors".

Quote:

I don't know why you make such a large problem of it.

After customizing UBCD, the new iso image also shows exactly the same list of "missing files and folders" in Isobuster.

I was just wondering if those "bad sectors" would get to a burned CD-RW, propagating "missing files/folders", or "bad sectors".

Quote:

You have to ask the ISObuster people, why they show such info. AFAI understand ISObuster can help you so retrieve files from bad CDs. They probably rather want to show some false-positives than don't showing them and missing some files that are really there.

You are right, but I wanted to be sure that is not something particular of my system, and that is not a problem generated by the ubcd2iso script or something related to UBCD.

I guess I'd have to check it with other tools (like the ones I mentioned a couple of paragraphs above) to be completely sure is a problem with Isobuster algorithm. Or maybe someone else already has those tools installed and want to check it? There must be some similar tool also under Linux, but that is far away from my knowledge.

Icecube, once again, thank you very much for your time and help.

Icecube · **Joined:** Fri Jan 11, 2008 2:52 pm **Posts:** 1275

Something I forgot to mention:
The FAT (floppy, hard disk, ... filesystem) subsection is totally irrelevant for ISO's, or at least for the UBCD ISO.
ISO's use iso9660 or udf as filesystem.

This FAT subsection would only be valid for ISO images which use floppy or hard disk emulation. Then the ISObuster algorithm for the FAT subsection finds the files inside the floppy (e.g.: MemTest Dlx 32 bit iso) or hard disk image (e.g.: DELL diagnostics ISO image) which is embedded in the ISO and is booted when you boot the ISO.

Most ISO's (Windows, ISOLINUX based, grub(4dos) based, grub2 based, ...) use no-emulation mode.

ady · **Joined:** Sat May 08, 2010 5:26 am **Posts:** 639

Icecube wrote:

The FAT (floppy, hard disk, ... filesystem) subsection is totally irrelevant for ISO's, or at least for the UBCD ISO.

This would point to the same direction you previously mentioned: it's a "problem" of Isobuster's algorithm.

So I guess a real/actual UBCD burned is not going to show nor "create" those "bad sectors".

Thanks for your time and help.

ady · **Joined:** Sat May 08, 2010 5:26 am **Posts:** 639

Quote:

I have never seen a program that could burn a new ISO image over a CD-RW that already had files on it, without erasing the CD-RW first. I don't know why it isn't supported. If you find a program that is able to do it, tell me. I am interested.

Icecube, reading ImgBurn guides:

Quote:

... ImgBurn will perform a full format. After that the DVD+RW, DVD-RAM or Blu-ray disc is just overwritten without the need for any sort of erase (it's not like DVD-RW in that respect).

This paragraph refers to formatting a DVD+RW the first time, and then you could use it again with no need to erase it every time. I know, it is not a CD-RW. I just thought I could mention it, just in case this info is of any interest.

defrag CONTENT of iso image

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