Table 157

+===========-=================================================================+
|   Value   |  Description                                                    |
|-----------+-----------------------------------------------------------------|
|     0h    |  Indicates the target should not distinguish between retaining  |
|           |  the indicated data and data placed into the cache memory by    |
|           |  other means (e.g. pre-fetch).                                  |
|           |                                                                 |
|     1h    |  Demand read retention priority:  Data put into the cache via a |
|           |  READ command should be replaced sooner (has lower priority)    |
|           |  than data placed into the cache by other means (e.g.           |
|           |  pre-fetch).                                                    |
|           |                                                                 |
|           |  Write retention priority:  Data put into the cache during a    |
|           |  WRITE or WRITE AND VERIFY command should be replaced sooner    |
|           |  (has lower priority) than data placed into the cache by other  |
|           |  means (e.g. pre-fetch).                                        |
|           |                                                                 |
|     Fh    |  Demand read retention priority:  Data put into the cache via a |
|           |  READ command should not be replaced if there is other data in  |
|           |  the cache that was placed into the cache by other means (e.g.  |
|           |  pre-fetch) and it may be replaced (i.e. it is not locked).     |
|           |                                                                 |
|           |  Write retention priority:  Data put into the cache during a    |
|           |  WRITE or WRITE AND VERIFY command should not be replaced if    |
|           |  there is other data in the cache that was placed into the cache|
|           |  by other means (e.g. pre-fetch) and it may be replaced (i.e.   |
|           |  it is not locked).                                             |
|           |                                                                 |
|  2h - Eh  |  Reserved                                                       |
+=============================================================================+