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SCSI Commands Reference Manual, Rev. J 81

www.seagate.com Direct Access Block commands (SPC-5 and SBC-4)

3.3.5 Address descriptor formats

3.3.5.1 Address descriptor formats overview

This subclause describes the address descriptor formats used in the FORMAT UNIT command, the READ DEFECT DATA

commands (see 3.24 and 3.25), and the Translate Address diagnostic pages (see 5.1.3) of the SEND DIAGNOSTIC command and

the RECEIVE DIAGNOSTIC RESULTS command.

The format type of an address descriptor is specified with:

a) the DEFECT LIST FORMAT field in the CDB, for the FORMAT UNIT command and the READ DEFECT DATA commands;

b) the SUPPLIED FORMAT field, for the SEND DIAGNOSTIC command Translate Address diagnostic page; or

c) the TRANSLATE FORMAT field, for the RECEIVE DIAGNOSTIC RESULTS command Translate Address diagnostic page.

Table 44 defines the types of address descriptors.

3.3.5.2 Short block format address descriptor

A format type of 000b specifies the short block format address descriptor defined in table 45.

SHORT BLOCK ADDRESS field

For the FORMAT UNIT command, the SHORT BLOCK ADDRESS field contains the four-byte LBA of a defect. For the READ DEFECT DATA com-

mands, the SHORT BLOCK ADDRESS field contains a vendor-specific four-byte value. For the Translate Address diagnostic pages, the SHORT

BLOCK ADDRESS field contains a four-byte LBA or a vendor-specific four byte value that is greater than the capacity of the medium.

Table 44 Address descriptor formats

Format type Description Reference

000b

Short block format address descriptor 3.3.5.2

001b

Extended bytes from index address descriptor

[a]

3.3.5.3

010b

Extended physical sector address descriptor

[a]

3.3.5.4

011b

Long block format address descriptor 3.3.5.5

100b

Bytes from index format address descriptor 3.3.5.6

101b

Physical sector format address descriptor 3.3.5.7

110b

Vendor-specific

All others

Reserved

[a] This address descriptor format type is defined for direct access block devices

using rotating media (see SBC-4).

Table 45 Short block format address descriptor (000b)

Bit

Byte

7 6 5 4 3 2 1 0

(MSB)

SHORT BLOCK ADDRESS

. . .

(LSB)