Automatic Acoustic Management - Hitachi 7K250 - Deskstar - Hard Drive Specifications

120 [ y [ 435
[sec] (default: 120 [sec])
1
= (x − 40h) & 60 +600
y
2
When Low RPM standby mode is the deepest Power Saving Mode and the value in Sector Count register is
between 01h and 3Fh,
where
120 [ y [ 435
[sec] (default: 120 [sec])
1
= 600
[sec]
y
2
x = the value in Sector Count register
y1 = the idle time to Low Power Idle mode
y2 = the idle time to Low RPM standby mode
If Low power idle mode has already been enabled (i.e., y1 has been set) before Low RPM standby mode is enabled,
y1 is preserved. If Low power idle mode is disabled (i.e., y1 has not yet been set), y1 becomes 120 seconds when
Low RPM standby mode is enabled.
Enabled Power Saving mode and idle time (y1 and y2) are preserved until Advanced Power Management is dis-
abled, the deepest Power Saving mode becomes Normal Idle mode, or a new time is set. They are initialized with
a hard/soft reset unless Reverting to Power on defaults is disabled and the devise receives a soft reset.
Additional electronics are powered off and the heads are unloaded on the ramp. The spindle is still rotated at the
full speed.
The heads are unloaded on the ramp and the spindle is rotated at the 60-65% of the full speed.
When Feature register is 85h (= Disable Advanced Power Management), the deepest Power Saving becomes nor-
mal Idle.

12.37.4 Automatic Acoustic Management

When Feature register is 42h (= Enable Automatic Acoustic Management), the Sector Count Register specifies the
Automatic Acoustic Management level.
FFH Aborted
C0-FEh Set to Normal Seek mode
80-BFh Set to Quiet Seek mode
00- 7Fh Aborted
The device preserves enabling or disabling of Automatic Acoustic Management and the current Automatic Acous-
tic Management level setting across all forms of reset, that is, Power on, Hardware, and Software Resets.
(600 [ y
[ 4380)
[sec]
2
Deskstar 7K250 Hard Disk Drive Specification
175