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101

SCSI-2 Drive Command Set

Read (Group 0) Command (08H)

Chapter 2 2-21

SCSI-2 Drive Commands

Read (Group 0) Command (08H)

This command reads data from the specified logical block address. A

maximum length of 256 logical blocks can be read using the Group 0

Read Command. If the number of logical blocks exceeds 256, use the

Group 1 Read command.

NOTE The Mode Select Commands (15H or 55H) impact all read, write, format

and erase commands.

Transfer

Length The Transfer Length field specifies the number of

contiguous logical blocks of data to be read. A Transfer

Length of 0 specifies that 256 logical blocks are to be

read. Any other value specifies the number of logical

blocks to be read.

PBA A Physical Block Address bit of 1 indicates that physical

block addressing is used. A PBA bit of 0 indicates that

logical block addressing is used.

Table 2-17 Read (Group 0) Command CDB

Byte 7 6 5 4 3 2 1 0

0 Operation Code (08H)

1 Logical Unit Number (0) Starting Logical Block Address (MSByte)

2 Starting Logical Block Address

3 Starting Logical Block Address (LSByte)

4 Transfer Length

5 PBA Reserved (0) Flag Link

1 2 ... 53 54 55 56 57 58 59 60 61 62 63 ... 377 378

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