INTERFACE COMMANDS
ModeSet/CheckCommands
Set Features Mode
Enables or disables features supported by the drive. When the drive receives this command it:
1.Sets BSY,
2.Checks the contents of the Features register,
3.Clears BSY and
4.Generates an interrupt.
If the value of the register is not a feature supported by the drive, the command is aborted. The acceptable values in the Features register are defined as follows:
VAL UE | DES C RIP TION | |
|
|
|
02h | Enabled Write Cache | |
|
|
|
03h | Set Transfer Mode based on value in Sector Count register | |
|
|
|
05h | Enable Advanced Power Management | |
42h | Enable Automatic Acoustic Management. The sector count register c ontains the | |
| Automatic Ac ous tic Management level. | |
| S EC TOR | LE VE L |
|
|
|
| F Fh | Maxtor specific |
|
|
|
| FEh | Maximum performance |
| Intermediate acoustic management levels | |
|
|
|
| 80h | Minimum acoustic emanation level |
|
|
|
| 00h- 7Fh | reserved |
44h | Length of data appended on Read Long/Write Long commands specified in the | |
| Identify D evice information | |
55h | Disable Read | |
|
|
|
66h | Disable reverting to | |
|
|
|
82h | D isable Write Cache | |
85h | Disable Advanced Power Management | |
|
|
|
AAh | Enable Read | |
BBh | 4 bytes of Maxtor specific data appended on Read Long/W rite Long commands | |
|
|
|
C2h | D isable Automatic Acoustic Management | |
|
|
|
CC h | Enable reverting to Power- on defaults |
7 – 6