HP0-J73 · Question #119

Which SCSI IDs are available for narrow SCSI devices?

The correct answer is A. 0 through 7. Narrow SCSI uses an 8-bit bus and supports exactly 8 device IDs, numbered 0 through 7. Wide SCSI doubles this to 16 IDs (0-15).

Storage Industry Concepts and Terminology

Question

Exhibit

Options

A0 through 7
B0 through 15
C1 through 6
D8 through 15

How the community answered

(28 responses)

A
93% (26)
B
4% (1)
C
4% (1)

Why each option

Narrow SCSI uses an 8-bit bus and supports exactly 8 device IDs, numbered 0 through 7. Wide SCSI doubles this to 16 IDs (0-15).

A0 through 7Correct

Narrow SCSI operates on an 8-bit wide data bus, which physically limits the number of addressable devices to 8. Device IDs range from 0 through 7, with ID 7 traditionally reserved for the host bus adapter due to its highest default priority.

B0 through 15

IDs 0 through 15 describe Wide SCSI, which uses a 16-bit bus to support 16 devices, not narrow SCSI.

C1 through 6

IDs 1 through 6 omits valid IDs 0 and 7 and does not correspond to any defined SCSI bus width standard.

D8 through 15

IDs 8 through 15 are the upper half of a Wide SCSI bus and are not accessible on a narrow SCSI configuration.

Concept tested: Narrow SCSI bus device ID addressing

Source: https://www.t10.org/scsi-3.htm

Topics

#SCSI#narrow SCSI#device IDs#storage interfaces

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