I've had some experience with 68 pin drives.
Most of it 'NOT GOOD'.
The only drive I was able to get working on my
A3k is a 68 pin Quantum Atlas V 9 gig.
I also have 2 (new) Fujitsu 4.2 gig 68 pin drives
that I am unable to get to work on my A3k or
my PC (Adaptec scsi).
The best I can say from my limited experience
is stay away from 'OEM' drives. It seems that
the standard 'run of the mill' drives work the best.
And I stay away from 'IBM' drives. I prefer Conner,
or Maxtor, ect.
Thats just my opinion, I'm sure others will differ.