SCSI drives

The first date is the date of introduction and the second the year the standard was approved.

The maximum devices supported includes the SCSI card itself, so, for example, only 7 hard drives can be attached to a card under a SCSI that supports 8 devices.

Trade
name
(date)
Max bus
speed
(MB/s)
Bus
width
(bits)
Maximum
bus length
(meters)
Maximum
devices
supported
Single
ended
LVD HVD
(narrow)
SCSI-1
(1981-6)
5 8 6 NA 25 8
(narrow)
Fast SCSI-2
10 8 3 NA 25 8
Fast/Wide
SCSI-2
20 16 3 NA 25 16
(narrow)
UltraSCSI-2
20 8 1.5 NA 25 8
3 NA NA 4
Ultra Wide
SCSI-3
40 16 NA NA 25 16
Wide Ultra
SCSI
40 16 1.5 NA NA 8
3 NA NA 4
Ultra2
SCSI
40 8 NA 12 25 8
Wide Ultra2
SCSI
80 16 NA 12 25 16
Ultra3
(Ultra 160)
SCSI
160 16 NA 12 NA 16
Ultra320
SCSI
320 16 NA 12 NA 16

 

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