USB thumb drive does full backup every time its plugged in

4GB Corsair USB thumb drive.
1 Partition, MBR, HFS+
I have 2 computers. PowerMac G5 and Macbook Pro. Each have there own Time Machine drives. Each time I plug my USB drive into one of these computers, syslog has this:
backupd[7080]: Starting standard backup
backupd[7080]: Backing up to: /Volumes/Time Machine/Backups.backupdb
backupd[7080]: Event store UUIDs don't match for volume: CORSAIR
backupd[7080]: Node requires deep traversal:/Volumes/CORSAIR reason:kFSEDBEventFlagMustScanSubDirs|
backupd[7080]: No pre-backup thinning needed: 1.22 GB requested (including padding), 6.31 GB available
backupd[7080]: Copied 4181 files (507.4 MB) from volume CORSAIR.
backupd[7080]: Copied 4556 files (507.5 MB) from volume Macintosh HD.
backupd[7080]: No pre-backup thinning needed: 660.7 MB requested (including padding), 5.78 GB available
backupd[7080]: Copied 9 files (0 bytes) from volume CORSAIR.
backupd[7080]: Copied 536 files (205 KB) from volume Macintosh HD.
backupd[7080]: Starting post-backup thinning
backupd[7080]: Deleted backup /Volumes/Time Machine/Backups.backupdb/bartleby/2008-05-01-100926: 5.78 GB now available
backupd[7080]: Post-back up thinning complete: 1 expired backups removed
backupd[7080]: Backup completed successfully.
Now, if I go plug the USB drive into the other computer, the same thing happens, and this cycle repeats over and over again. I tried re-formating the drive, deleting the backups from both Time Machine drives and starting from scratch. No luck.
Thing is, I have a smaller 1GB usb thumb drive and it doesn't exhibit this behavior. I could go back and forth between computers and there is no UUID match problem. I guess for now I can exclude the USB drive from one of the computers and only have the backup on one Time Machine drive, but that is not optimal.
The only difference between the two USB drives is the partition scheme. On the 1GB, it is using Apple Partition Map and 4GB is using MBR. The reason why I am using MBR is because with MBR the 4GB drives formats to 3.75GB, with APM 3.62GB and with GUID (intel macs) 3.42GB. So MBR gives me the maximum space.

For a PPC mac the partition map for a Time Machine drive must be APM. For an Intel mac it must be GUID. In fact both kinds of mac are being successfully backed up to the same drive by some posters, but I doubt you'll get much luck with a partition map that isn't one of those.

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