Table 251
+=====-========-========-========-========-========-========-========-========+
| Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|Byte | | | | | | | | |
|=====+=======================================================================|
| 0 | Operation code (42h) |
|-----+-----------------------------------------------------------------------|
| 1 | Logical unit number | Reserved | MSF |Reserved|
|-----+-----------------------------------------------------------------------|
| 2 |Reserved| SubQ | Reserved |
|-----+-----------------------------------------------------------------------|
| 3 | Sub-channel data format |
|-----+-----------------------------------------------------------------------|
| 4 | Reserved |
|-----+-----------------------------------------------------------------------|
| 5 | Reserved |
|-----+-----------------------------------------------------------------------|
| 6 | Track number |
|-----+-----------------------------------------------------------------------|
| 7 | (MSB) |
|-----+--- Allocation length ---|
| 8 | (LSB) |
|-----+-----------------------------------------------------------------------|
| 9 | Control |
+=============================================================================+