It is currently Tue Nov 25, 2014 8:02 pm

All times are UTC - 8 hours




Forum locked This topic is locked, you cannot edit posts or make further replies.  [ 4 posts ] 
Author Message
 Post subject: Boot from USB drive without bios support
PostPosted: Fri Jun 01, 2007 8:49 pm 
Offline

Joined: Fri Jun 01, 2007 8:38 pm
Posts: 2
Location: California, USA
I am still trying to understand all the wonderful support UBCD provides. Very impressive!

I would like to see an option to boot from a usb device when this support is NOT available from the bios. This is often the case when using an older machine. Or even a new machine where the system designers were not paying attention to the real world.

As cheap as USB-HDD are it make a lot of sense to install linux to an external drive leaving your installed Windows system alone. Dual boot systems can frighten some people away.

I include the following link http://www.neowin.net/forum/index.php?showtopic=269145
from someone who claims success with a particular methodology. I do not have the expertise to duplicate the effort.

Thanks!


Top
 Profile  
 
 Post subject:
PostPosted: Sat Jun 02, 2007 5:34 pm 
Offline

Joined: Mon Feb 21, 2005 10:59 pm
Posts: 1304
Someone correct me if I am wrong.

From my limited technical understanding, I don't think there is a generic approach to this problem.

The best one can do is to go for an OS-specific solution eg. certain Linux distros have their own boot floppies/CDs for booting a USB device on non-supporting hardware.


Top
 Profile  
 
 Post subject:
PostPosted: Sun Jun 03, 2007 9:44 am 
Offline

Joined: Fri Sep 23, 2005 1:21 am
Posts: 336
Location: France
This idead reminds me of programs to overcome the old 1024 cylinders BIOS limitation, that could be installed in HDDs' MBR ... so I suppose it could be done somehow, yet I don't know one.

_________________
Hammerite Compendium of Precepts, Regimens and Rules of Conduct, Vol. 113 :
A stroke of thy chisel, once made, canst be undone, but a stroke thou dost not make from fear is a worse flaw.
Be not cautious - be correct.


Top
 Profile  
 
 Post subject: Comparison of a sort
PostPosted: Sun Jun 03, 2007 4:35 pm 
Offline

Joined: Fri Jun 01, 2007 8:38 pm
Posts: 2
Location: California, USA
I remember when CD hardware was the archetypical nasty device. The drivers were a headache to install and the result was quite unreliable. Now CDs are so well behaved that you can boot from them. In fact, they are now the most common boot media for installations.

If I am understanding the situation correctly bios boot code is not that large. I recently got a bios update for one of my computers and the bios update and install code is only 234K bytes. If USB boot is possible in such a small program why cannot the same code be provided from some other source? Code is code, right? There is certainly lots of room left on the CD with the current UBCD.

No bios that I am aware of will boot from the second hard drive but UBCD will do this. So the limitations of the bios are not critical to a feature. UBCD is booted from and then, using the appropriate magic, the boot process passes onto the second hard drive. Do the same for a USB device.

It should not matter if the UBCD boot from USB option is Linux or Windows, the eventual target takes over and the boot code is paved over.


Top
 Profile  
 
Display posts from previous:  Sort by  
Forum locked This topic is locked, you cannot edit posts or make further replies.  [ 4 posts ] 

All times are UTC - 8 hours


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

Protected by Anti-Spam ACP Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group