In fact, I forgot to mention, but I was using the OS 8 Drive Setup utility.
I tried Lido, and this one told me, while scanning the SCSI bus, that it cannot read the drive capacity and a few other error message while reading the SCSI drive. So, I may mean that the drive just failed of natural death.
The other one I have is a Micropolis one. Was under the impression they were booth Seagate. I'll have to find the jumper setting for this one, to make it different from SCSI 0 not to conflict with the already install internal disk and see if it work. Otherwise, they will have to go to the recycling... Too bad, 2 gig!!!
Those drives may be failed as they were used in a Radio station and may have been on for quite a while before going to storage.