Request Block Address 02H - Freecom TAPEWARE AIT-250I Specification

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-250V 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.
6-64
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-E Turbo drive SDX-250V series Ver.1.0
1 0
Flag Link
1 0