15.28.1 Set Transfer mode
When Feature register is 03h (=Set Transfer mode), the Sector Count Register specifies the transfer
mechanism. The upper 5 bits define the type of transfer and the low order 3 bits encode the mode value.
PIO Default Transfer Mode
00000 000
PIO Default Transfer Mode, Disable IORDY
00000 001
PIO Flow Control Transfer Mode x
00001 nnn (nnn=000,001,010,011,100)
Multiword DMA Mode x
00100 nnn (nnn=000,001,010)
Ultra DMA Mode x
01000 nnn (nnn=000,001,010,011,100,101)
15.28.2
Write Cache
If the number of auto reassigned sector reaches the device's reassignment capacity, the write cache
function will be automatically disabled. Although the device still accepts the Set Features command with
Feature register = 02h without error, the write cache function will remain disabled. For the current write
cache function status refer to the Identify Device Information (word 85 or 129) by Identify Device
command.
15.28.3 Advanced Power Management
When Feature register is 05h (=Enable Advanced Power Management), the Sector Count Register
specifies the Advanced Power Management level.
C0-FFh --- Aborted
80-BFh --- The lowest power consumption mode is Low power Idle mode
40-7Fh --- The lowest power consumption mode is Low RPM standby mode
00-3Fh --- Aborted
15.28.3.1 Low Power Idle mode
In Low Power Idle mode additional electronics are powered off and the heads are unloaded onto the
ramp. The spindle continues to rotate at the full speed during these electronic power offs and head
unloads.
15.28.3.2 Low RPM standby mode
The heads are unloaded on the ramp and the spindle is rotated at the 60–65% of full speed.
When the Feature register is 85h (=Disable Advanced Power Management) the deepest Power Saving
mode becomes normal Idle.
15.28.4 Automatic Acoustic Management
When the Feature register is 42h (=Enable Automatic Acoustic Management) the Sector Count Register
specifies the Automatic Acoustic Management level.
FF ---
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 Acoustic Management level setting across all forms of reset—that is, Power on, Hardware,
and Software Resets.
Deskstar 60 GXP Hard disk drive specification
150
Содержание IC35L020 - Deskstar 20 GB Hard Drive
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