Okay, I’ll bite.
If the drives in your G3 Mini Tower are not SCSI drives, what type of drives are they?
(Attach a pic of the 2 drives in-place and maybe even a close-up
of one of those drives’ paper labels.)
Any chance one of those drives is partitioned into at least, 2 separate volumes?
Shift+click (select) all drives mounted on your desktop, then Command+I to get info
on all three and then screenshot that screen with all those info windows open
and post that here.
Then maybe someone here can help you with your mysterious phantom disk.
*Just for fun… (booted with OS 10.2.8 ) open disk utility and screenshot that screen
showing the disks so that we may see the disk(s) hierarchy.
This reminds me of the old Blue & White here that had the “new” initial OS X installed
with OS 9 originally resident. IIRC, that installation of OS X didn’t partition the drive
for two OS’es - but instead installed OS X right on the same drive with OS 9.
An often functional and occasionally freeze-prone nightmare.