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                                 |
+=============================================================================+