Okay. I went to five stores this evening, and finally found one that had Fujifilm brand 700 MB blank CD-R disks (48x). (The things I don't do for you guys).
I put the ubuntu 7.04 iso file (32 bit/i86/desktop/gnome) I had downloaded on an old Windows 2K computer.
Linux reports the size of that iso file as 697.9 MB
Windows reports the size of that same iso file as 714.646 MB (714,646 KB)
I burned the iso file to a Fujifilm 700 MB blank CD-R disk on the Windows 2K machine with the free CD/DVD burning program
Burn4Free. The burn worked flawlessly multiple times, and the disks created were all bootable/installable.
Test machine specs:
Windows 2000 SP4
Burn4Free 2.0.0.0
Four Yamaha SCSI CD-R/W drives (16x 10x 40x)
Adaptec AIC-7850 PCI SCSI controller
Intel Celeron 2.20 Ghz
S3 Graphics ProSavageDDR
512 MB RAM
75 GB IDE hard drive
The problem is not your Fujifilm disks, BlackWolf. I suspect there may be something wrong with the iso file you downloaded, or the disks you think are blank may not actually be blank (I can't tell you how many times I've done that, myself - made some slight error with a burn and ruined a disk, but then returned it to my stack of blanks because it looked like there was nothing on it and it might still be good).
Download the iso file again, this time from
bigdog83.
Download and install
Burn4Free.
Burn the new iso to a blank 700 MB CD-R as a bootable disk with Burn4Free (Click Drive>Burn ISO. Then direct the wizard to the location of the ubuntu 7.04 iso file on your hard drive). Let it burn.
Enjoy.