Hitachi 7K250 Specifications - Page 189
Automatic Acoustic Management
UPC - 000004558972
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120 [ y1 [ 435 [sec] (default: 120 [sec]) y2 = (x − 40h) & 60 +600 [sec] (600 [ y2 [ 4380) 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 [ y1 [ 435 [sec] (default: 120 [sec]) y2 = 600 [sec] 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 disabled, 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 normal 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 C0-FEh 80-BFh 00- 7Fh Aborted Set to Normal Seek mode Set to Quiet Seek mode Aborted The device preserves enabling or disabling of Automatic Acoustic Management and the current Automatic Acoustic Management level setting across all forms of reset, that is, Power on, Hardware, and Software Resets. Deskstar 7K250 Hard Disk Drive Specification 175