Table of Contents
Advertisement
6.Command Specification
6.20. REQUEST BLOCK ADDRESS 02h
Bit
7
Byte
0
1
Logical Unit Number
2
3
4
5
Unused (00b)
The REQUEST BLOCK ADDRESS command reports the current position of the logical unit. No medium movement
shall occur as a result of the command. This command is used in conjunction with the SEEK BLOCK (0Ch)
command.
Note: This command is similar in function to the SCSI-2 READ POSITION command and is supported by the
SDX-550V to allow backward compatibility with QIC-104 type devices.
Blocks are numbered sequentially, starting with 0 at BOT. Each SCSI 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.
Bit
7
Byte
0
1
2
The Logical Block Address fields contain the current tape position block number.
6-82
6
5
4
Operation Code (02h)
Allocation Length (03h)
Table 6-69: Request Block Address Data Format
6
5
4
Logical Block Address (MSB)
Logical Block Address
Logical Block Address (LSB)
REQUEST BLOCK ADDRESS
3
2
Reserved
Reserved
Reserved
Reserved
3
2
SONY AIT-2 Turbo drive SDX-550V series Ver.1.0
1
0
Flag
Link
1
0
Advertisement
Table of Contents
