Download UBCD

If you have arrived here from an external link, Ultimate Boot CD allows you to run floppy-based diagnostic tools from CDROM drives and consolidate as many diagnostic tools as possible into one bootable CD. An experimental feature also allows you to run UBCD from your USB memory stick on newer machines that supports booting from USB devices. Read more about UBCD and the full list of freeware diagnostic tools included here.

If you live on the cutting edge, a beta version of UBCD V5.0 is now available for testing.

as702 has contributed an updated version of dosubcd.img for UBCD V4.1.1, including instructions. This is the same version of dosubcd.img that is included in the beta version of UBCD V5.0.

Please note that I do not host the downloads directly due to the sheer amount of bandwidth required and its associated cost. Instead I rely on a network of mirror sites offered and maintained by volunteers. If you find a particular mirror site to be down temporarily, please be patient and try another one.

Ultimate Boot CD is available in various formats:

V4.1.0

Download format Size Checksums

ISO image
115MB [MD5 ] cfed7ac541890d26dc863cdb4489862c
[SHA1] 5b0e496ab6c32ef736b235a4c0bc289cc8731109

Self-extracting EXE
87MB [MD5 ] f244281ec6310a90780e730f0b073d5a
[SHA1] cbd4ad281200c9210e9343e344652d6840d8e6d9

Plain old ZIP
95MB [MD5 ] 5a4bbcd5750b8b799952af0c93c73dfa
[SHA1] 805719b038566eb99f060245d4827306ea9ae943

V4.1.1

Download format Size Checksums

ISO image
115MB [MD5 ] 220721fb734186b9d54e4fbacdfc035d
[SHA1] 838f9103a887f34bbd143683a7e58d224a69dfc5

Self-extracting EXE
87MB [MD5 ] 35a9a6d4c2133a43b81bfa7756c606d1
[SHA1] 2976386d93dd44fe83e6f8257db528fbbafa0d4a

Plain old ZIP
95MB [MD5 ] 8f873fee326504e7c3521c8278e2cad8
[SHA1] f640ae63ee6fa76eaffbd800d2aaf456a20f3595

Few, if any, of the mirror sites offer the ISO image directly due to the inefficiency of sending an uncompressed image. They will typically host the ZIP and/or self-extracting EXE archive, which is much smaller than the original ISO image after compression. Where possible, please download the self-extracting EXE archive because it is a good deal smaller than the ZIP archive, which means you can download it a little faster, and the mirror site will use less of its bandwidth resource.

After you have downloaded either the ZIP or self-extracting EXE archive, extract it to your harddisk. You should get a single file called ubcdnn.iso, where nn is the version number eg. ubcd40.iso. Some users have reported seeing a whole bunch of folders and files after performing the extraction. This is wrong, and is likely the result of your decompression utility trying to be too smart. Some decompression utility, on seeing the ISO file in the archive, will attempt to extract the content of the ISO file! Try tweaking with the options of your decompression utility, or use another decompression utility. I would recommend using 7-Zip, which is an open-source freeware that is capable of extracting both ZIP and 7-Zip archives, in addition to many other types of archive files.

If you have problems extracting the archive, try comparing your download with the file size or checksum above. If you don't already have tools to calculate the MD5 or SHA-1 checksum, I recommend eXpress CheckSum Calculator, though there are tons of other checksum calculators or verifiers around that you can easily locate with a simple Internet search.

After you have successfully extracted the single ISO file, you now need to burn it 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. 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.

If you wish to try the experimental option of running UBCD from a USB memory stick, you will need to either burn the ISO file to a CD first, or extract the files within the ISO file to your hard disk using a suitable utility. Then, use tools\ubcd2usb\ubcd2usb.bat to write UBCD to your USB memory stick. Note that ubcd2usb.bat will format and erase your entire USB memory stick. Due to its experimental nature, some or all of the UBCD apps may not work even if your machine supports booting from a USB memory stick.

Patch files

The following patch files are available for the original UBCD V4.1.0 ISO image file. To apply any of the patch files, you need xdelta.exe (local mirror). Then at the command prompt, type:

xdelta patch [path to xdelta file] [path to ubcd410.iso] [path to new ISO image]

eg.

xdelta patch ubcd410to411.xdelta ubcd410.iso ubcd411.iso

Description Size

Updates UBCD V4.1.0 to V4.1.1. Fixes all the issues listed for V4.1.0 in the Known Problems page.

MD5  = 860cd802c294918b9db3601597d67e13
SHA1 = 7abacf0782c68ff90b9e733349728d99646d9777
2KB

French translation for UBCD V4.1.1

MD5  = a71b5dfcf7020e05e0fca43b0b26682f
SHA1 = e462f2ecd4f538c015a280adf92c8982a557c522
1.5MB

Italian translation for UBCD V4.1.1

MD5  = e934e276f8b99e211988f0d9abd43371
SHA1 = ebcea0f2730122abcb88d9fa534b93cf4387f18e
34.5KB