Read (Group 0) Command (08H) - HP 2600fx - Optical Disk Drive Command Reference Manual

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.
Table 2-17 Read (Group 0) Command CDB
Byte
0
1
2
3
4
5
Transfer
Length
PBA
Chapter 2
7 6 5
Logical Unit Number (0)
Starting Logical Block Address
Starting Logical Block Address (LSByte)
PBA
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.
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.
Read (Group 0) Command (08H)
4 3
Operation Code (08H)
Starting Logical Block Address (MSByte)
Transfer Length
Reserved (0)
SCSI-2 Drive Command Set
2 1 0
Flag Link
2-21