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Interface standards
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SCSI overview

SCSI overview


SCSI Terminology
SCSI Bus
Width (bits)
SCSI Bus
Speed (MBps)
SCSI-1
8
5
Fast SCSI
8
10
Fast Wide SCSI
16
20
UltraSCSI
8
20
Wide UltraSCSI
16
40
Ultra2 SCSI
8
40
Wide Ultra2 SCSI
16
80


SCSI Name
Max. Bus Length, Metres
Single-Ended
Differential
LVD
Max. Devices
SCSI-1
6 m
25 m
12 m
8
Fast SCSI
3 m
25 m
12 m
8
Fast Wide SCSI
3 m
25 m
12 m
16
UltraSCSI
1.5 m
25 m
12 m
8
UltraSCSI
3 m
    
4
Wide UltraSCSI  
25 m
12 m
16
Wide UltraSCSI
1.5 m
    
8
Wide UltraSCSI
3 m
    
4
Ultra2 SCSI    
12 m
8
Wide Ultra2 SCSI    
12 m
16


Learn more: SCSI 1, 2, 3 and 5 connectors