What is the main difference between SCSI and Wide SCSI?

seenagape

11 years ago

A.
Wide SCSI has twice the bus width than SCSI and hence twice the maximum data transfer speed.

B.
Wide SCSI has a wider connector with 68 pins while SCSI has connector with 50 pins.

C.
Wide SCSI has a longer maximum cable length than SCSI.

D.
Wide SCSI operates at twice the bus speed than SCSI and hence twice the maximum data transfer speed.

Explanation:
Wide SCSI and SCSI have the same bus speed of 5 MHz, but Wide SCSI has a data bus width of 16 bits (2 bytes) while SCSI has a data bus width of 8 bits (1 byte), hence Wide
SCSI can support mode devices and has a higher maximum transfer speed.
Incorrect Answers:
B: Both SCSI and Wide SCSI have 50-pin connectors. 68-pin connectors were introduced with Ultra Wide SCSI.
C: Both SCSI and Wide SCSI have a maximum cable length of 20 feet (6 meters).
D: Both SCSI and Wide SCSI operate at the same bus speed of 5 MHz.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 143-147.