Terms and Terminology


STA Terms


Bus Speed,
MBytes/Sec. Max.



Bus Width,
bits



 

Max. Bus Lengths, Meters (1)


Max. Device
Support


Single-ended
LVD
HVD

SCSI-1(2)


5


8

6

(3)


25


8


Fast SCSI (2)


10


8


3


(3)


25


8


Fast Wide SCSI


20


16


3


(3)


25


16


Ultra SCSI (2)


20


8


1.5


(3)


25


8


Ultra SCSI (2)


20


8


3








4


Wide Ultra SCSI


40


16





(3)


25


16


Wide Ultra SCSI


40


16


1.5








8


Wide Ultra SCSI


40


16


3








4


Ultra2 SCSI (2,4)


40


8


(4)


12


25


8


Wide Ultra2 SCSI (4)


80


16


(4)


12


25


16


Ultra3 SCSI or Ultra160 SCSI (6)


160


16


(4)


12


(5)


16


Ultra320 SCSI (6)

320


16


(4)


12


(5)


16

Ultra640 640 16 (4) (7) (5) 16