gilmanjr,
I'm currently not going to answer about usb here. Instead, I'd like to advice you about several much more basic things. Things that, according to your other post, seems to me you need to know first of all.
First, please stop double posting.
I am unacquainted with the procedure for checking with MD5 and SHA1 checksums. Could you please explain? I may still have my original UBCD 5.0.3 torrent. If not, I'll redownload it.
According to this topic where we are currently writing, you already have UBCD 5.0.3 version burned to CD.
Here we have 2 separate issues. First, you don't need to download both files, the torrent and the iso image. The torrent file is just one method or mean to get the iso image. So if you already have the iso image, you don't need the torrent file.
The second issue about that paragraph is that ubcd51a1 is an alpha version. If you don't already know some other more basic things, an alpha version is not for you. I sincerely don't mean to offend you; I just want to avoid wasting your time downloading something that most probably is not going to help you with your current situation.
If you can get assistance from some friend that knows more about these issues, then maybe, just maybe, ubcd51a1 may work better than ubcd503. My first bet would be, still, keep trying first with ubcd503, even with help from friends.
All this may take a few days. I only have dial-up Internet service, so must visit a local library or college to access a high speed service.
That last paragraph only reinforce what I already told you.
Anyway, if you want to confirm that your ubcd503.iso is the correct one, and if you still have the original download, then here are some info and tips.
From
http://www.ultimatebootcd.com/download.html , you can read:
After you have download the ISO image file, verify the integrity of the image by comparing the MD5/SHA1 checksum of the image with the values above. If you do not have tools to calculate the MD5 or SHA1 checksum, you can try eXpress CheckSum Calculator, though there are tons of other checksum calculators or verifiers around that you can easily locate with a simple Google search.
The link in that quote, for "eXpress CheckSum, is
http://www.irnis.net/free.shtml .
Other several alternative programs for checksum and/or hash, some freeware and some not, are listed at
http://www.softpedia.com/hubs/Checksum-Verifiers .
Alternatively, you may search using some web search service, like Google
http://www.google.com/#hl=en&expIds=172 ... 6c17f79c85 .
Additionally, one alternative to 7-zip (mentioned in several tutorials about ubcd) is PeaZip,
http://www.peazip.org , which has also checksum functions.
My personal choice about checking MD5, SHA1 and other hash codes is Arpoon checksum
http://www.arpoon.de/checksum.html.
Now, if the official mirrors to download ubcd503.iso are not working, (or in the future, any future stable versions) you may try waiting and trying afterwards, or some other repositories like (for
ubcd503, this links are current) :
http://majorgeeks.com/Ultimate_Boot_CD_UBCD_d4981.html for several servers;
http://www.softpedia.com/progDownload/U ... -5992.html for USA server.
Both links include options to ubcd503.iso or for the corresponding torrent.
Those are NOT the only UNofficial repositories; there are many others. In any case, official or unofficial, you should
always check both MD5 and SHA1 codes with the ones published at
http://www.ultimatebootcd.com/download.html .
This way (checking hash codes), you avoid several issues and assure at least that you have the correct file (correctly) downloaded. For checking the already burned CD there are other additional methods, but I won't mention those now.
In addition to checksums / hash codes, torrents and alpha versions, I'd like to quote additional info from
http://www.ultimatebootcd.com/download.html :
Now you need to burn the ISO image to CD. This is another topic that frequently trips up newbies who are not familiar with their CD recording software, such as Nero or Easy CD Creator. Some of you end up burning the ISO file itself to the CD, or some other weird results.
The easiest way to burn the ISO file to CD is to use a small specialized freeware such as BurnCDCC or Active@ ISO Burner. For further assistance, refer to the tutorials section for help with burning the ISO image to CD with various popular CD recording software. Where possible, experiment with CDRW discs instead of CDR discs so that you can start over if something goes wrong, instead of churning out coasters.
There are many (many, really! ) freeware simple tools (and tutorials) to correctly burn an iso image. It seems that in your case you already got the CD, so I won't get into it now. I just wanted to "complete" the above mentioned points for other newbies that may be reading this post.
@gilmanjr, if you need more help about your problem with usb, please continue posting here in this topic and avoid double posting.
If you need help with another specific issue other than the current usb one, please open a new topic at the adequate forum category (or better yet

, first search the forum and the ubcd wiki for similar issues and only
then open a new topic).
I hope this info helps for future basic reference, even when most of this info is already published somewhere at some section of
http://www.ultimatebootcd.com , or the ubcd forum, or the ubcd wiki.