SCSI drive woes

[apple2pd@icaen.uiowa.edu (ISCA AppleII Librarian)]

I recently was given some old SCSI harddrives which came from older Macs.
I also finally order an external SCSI case and power-supply from Alltech
so I can test these drives.  I have put the drives into three piles:

The good, the bad, and the UGLY.

The UGLY is a Quantum 40S (40meg scsi) with the Apple sticker indicating
it (was) is a Mac compatible scsi drive.  I call it 'the drive from HELL' ;-)

Test equip:  Mac LC III, 8Meg, system 7.5.5.

  With this cpu, I could tell which drives were probably OK, which were bad,
but the UGLY drive from HELL would not be recognized by Finder, Disk FirstAid,
etc.  It just didn' exist.

Test equip:  IIGS Rom01, 4Meg, ZipGS 8/64, Apple Hi-speed SCSI (DMA off),
Appletalk active and logged into an Appleshare 3.0 server.

This cpu agrees with the LC on the good and bad drives.  But gives hope for
the UGLY drive from HELL.  Up front, I admit I have had to send this drive
through SCSI Voodoo training classes (there was a reason it was pulled from
a Mac at some time I guess.).  When connected to the IIGS the first time
as SCSI ID 4 daisychained to my 20Meg (Miniscribe, Mac SE pull) SCSI ID 6
boot drive, the finder said the drive wasn't recognized and did I want
to eject or initialize.  I initialized as HFS.  Fine.  I diddled a bit
and the drive seemed OK, so I ran ADU from my boot drive to partition the
drive into 2 20Meg partitions.  I choose partition from the Main menu
and then set the partition names/sizes and clicked the partition option to
actually set the parttions.  ADU can back with error to the effect that
the Mac driver partition couldn't be written - the drive appears unreliable.

So I rebooted and re-inited from the finder etc. tried ADU with same results
a couple more times.  Then I punted.  I tried p8 and CSU (Chinook SCSI
Utilities v1.5).  CSU did not and still will NOT recognize this drive.  It
consistently shows only my 1) SCSI #6 harddrive and 2) Quit Utilities.

I ran a couple p8 disk verify programs (Apple Utilites verify disk and
AW5.1 Disk verify and read/write verify programs on the disk without problems.