IBM IC35L020 Hard Drive Specifications - Page 164

Set Transfer mode, Write Cache, 28.3 Advanced Power Management

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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 PIO Default Transfer Mode, Disable IORDY PIO Flow Control Transfer Mode x Multiword DMA Mode x Ultra DMA Mode x 00000 000 00000 001 00001 nnn (nnn=000,001,010,011,100) 00100 nnn (nnn=000,001,010) 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 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 60 GXP Hard disk drive specification 150

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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