Need Help with A2091's

[Tahoe]

First check the version of the ROM's on the card. If they are 7.0 you can use basically any 50pins SCSI drive, if they are 6.6 or lower you can not use drives larger than 1GB.
You can but you can only use 1GB effectively. If you get a 2GB drive partition it only half! (found this out the hard way)

[Tahoe]

Never tried larger than a 9.1GB
50Pins disks are the older type, you won't find a 100GB 50Pins SCSI disk  :-D

Mind you, if you want to use a disk larger than 4GB you need OS3.9, i think.

Best bet would be to get yourself a nice 2.1 or 4.3GB disk, dead cheap and works fine in your miggy.