SCSI Electrical Interface: Low Voltage Differential (LVD). Drives Supported: Up to 15 Wide Ultra2 SCSI, Wide-Ultra SCSI-3, Fast-Wide SCSI-2 or Fast SCSI-2 Hard Drives. When used with the ProLiant Storage System Model UE, the SA-3200 supports up to 12 HDD per channel. Maximum Transfer Rate on System Bus (peak): 133 MB/s. Simultaneous Drive Transfer Channels: Two. Total Channel Transfer Rate: 160 MB, 80 MB/s per channel4.