You need the Ultimate Boot CD if you want to:
Run floppy-based diagnostic tools from CDROM drives. More and more PCs are shipped without floppy drives these days, and it is such a royal pain when you need to run diagnostic tools on them.
Free yourself from the slow loading speed of the floppy drive. Even if you do have a floppy drive, it is still much much faster to run your diagnostic tools from the CDROM drive, rather than wait for the tool to load from the floppy drive.
Consolidate as many diagnostic tools as possible into one bootable CD. Wouldn't you like to avoid digging into the dusty box to look for the right floppy disk, but simply run them all from a single CD? Then the Ultimate Boot CD is for you!
This will create an ISO image which you can use to create a bootable CD with your favorite CD burning software.
The "Basic" version of UBCD does not include INSERT. Hence it is much smaller than the "Full" version of UBCD. If you do not think you will be using INSERT, you should download this version.