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7. ATAPI Packet Command Specification
7.16. REQUEST BLOCK ADDRESS 02h
Bit
7
Byte
0
1
2
3
4
5
6
7
8
9
10
11
The REQUEST BLOCK ADDRESS command reports the current position of the logical unit. No medium
movement shall occur as a result of the command.
Note: This command is similar in function to the SCSI-2 READ POSITION command and is supported by the
SDX-560V to allow backward compatibility with QIC-104 type devices.
Blocks are numbered sequentially, starting with 0 at BOT. Each Block, File-mark or Save Set Mark after BOT adds
one to the count.
Allocation Length: Indicates the number of bytes of the Block Address to transfer. A value of ZERO indicates that
the default data Transfer Length of 3 bytes is used.
Table 7-53: REQUEST BLOCK ADDRESS Data Format
Bit
7
Byte
0
(MSB)
1
2
The Logical Block Address fields contain the current tape position block number.
7-52
6
5
4
Operation Code (02h)
Allocation Length (03h)
6
5
4
Logical Block Address
REQUEST BLOCK ADDRESS
3
2
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
3
2
SONY AIT-2 Turbo drive SDX-560V series Ver.1.0
1
0
1
0
(LSB)
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