I have a 7-8 year old rev 5.0, and it is able to be powered directly from the SCSI cable, without an external power source. But like IM said, must depend on the particular unit.
I would use MYS to format the drive(s), then CYA to remap them.
My 3 SCSI drives are set as:
SCS1 = SCSI ID 0 (this is SCSI2SD drive #1)
SCS2 = SCSI ID 1 (SCSI2SD drive #2)
SCS3 = SCSI ID 2 (SyQuest EZ 135)