ich hab grad aus langeweile mal n bissi auf der Fujitsu Homepage gesurft, und bin in einem Manual auf folgende Textpassage gekommen:
1.11 Advanced Power Management (APM)
The disk drive automatically shifts to the power saving mode according to the
setting of the APM mode under the idle condition.
The APM mode can be chosen with a Sector Count register of the SET
FEATURES (EF) command.
The disk drive complies with the three kinds of APM modes that a command
from the host is required.
FR = 05h : Enable APM
SC = C0h - FEh : Mode-0 Active Idle → Low Power Idle
SC = 80h - BFh : Mode-1 Active Idle → Low Power Idle (Default)
SC = 01h - 7Fh : Mode-2 Active Idle → Low Power Idle → Standby
FR = 85h : Disable APM (Set Mode-0)
Active Idle: The head is in a position of extreme inner in disk
medium. (VCM Lock)
Device Overview
1-14 C141-E224
Low Power Idle: The head is unloaded from disk.
The spindle motor rotates.
Standby: The spindle motor stops.
In APM Mode-1, which is the APM default mode, the operation status shifts till it
finally reaches "Low Power Idle."
Table 1.7 Advanced Power Management
APM Mode
Active Idle
(VCM Lock)
Low Power Idle
(Unload)
Standby
(Spin Off)
Mode-0 0.2-1.2 sec 15 min. N/A
Mode-1 0.1-0.2 sec 10.0-27.5 sec N/A
Mode-2 0.1-0.2 sec 10.0-27.5 sec 10.0-40.0 sec
When the maximum time that the HDD is waiting for commands has been
exceeded:
Mode-0: Mode shifts from Active condition to Active Idle in 0.2-1.2, and to Low
Power Idle in 15 minutes.
Mode-1: Mode shifts from Active condition to Active Idle in 0.1-0.2 seconds and
to Low Power Idle in 10.0-27.5 seconds.
Mode-2: Mode shifts from Active condition to Active Idle in 0.1-0.2 seconds and
to Low Power Idle in 10.0-27.5 seconds. After 10.0-40.0 seconds in
Low Power Idle, the mode shifts to standby.
Remark:
The default values of these settings are reflected in the WORD 91 values of the
IDENTIFY DEVICE command. Also, the APM mode is initialized to Mode-1
(default value) at power-off.
The above mentioned is time until shifting to each power mode based on point
that the drive becomes a command waiting state.
Ich weiß nich wieso, aber ich hab das Gefühl das man das APM durch Veränderung der Sector Count Register doch ausschalten kann.
Leider stecke ich in der Technik nicht so weit drin als das ich sagen könnte wie man da dran kommt. Evtl. ist da ja jemand etwas weiser als ich.
Gruß,
Doc
P.S.: Falls das ganze schon bekannt sein sollte und nicht praktikabel ist, bitte löschen. Ansonsten könnte es ne nette alternative zu den Hitachi Platten sein.