IBM IC35L040AVVN07-0 Hard Drive Specifications - Page 168

Set Transfer mode, 29.2 Write Cache, 29.3 Advanced Power Management

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Page 168 highlights

85H 86H 89H AAH BBH C2H CCH DDH Disable Advanced Power Management Disable Power-up in Standby mode Disable Address Offset mode Enable read look-ahead feature 4 bytes of ECC apply on Read Long/Write Long commands Disable Automatic Acoustic Management Enable reverting to power on defaults Disable release interrupt Note: After a power on reset of hard reset the device is set to the following features as default: Write cache ECC bytes Read look-ahead Reverting to power on defaults Release interrupt : Enable : 4 bytes : Enable : Disable : Disable 11.29.1 Set Transfer mode When Feature register is 03h (= Set Transfer mode), the Sector Count Register specifies the transfer mechanism. The upper 5 bits defines the type of transfer and the low order 3 bits encodes 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) 11.29.2 Write Cache If the number of auto reassigned sectors reaches the reassignment capacity of the device, the write cache function will automatically be disabled. Although the device still accepts the Set Features command with Feature register = 02h without error, the write cache function remains disabled. For current write cache function status refer to Figure 100 "Identify Device Information" (word 85 or 129) on page 117. 11.29.3 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 11.29.3.1 Low Power Idle mode Additional electronics are powered off and the heads are unloaded on the ramp. The spindle is still rotated at the full speed. Deskstar 120GXP hard disk drive specifications 154

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85H
Disable Advanced Power Management
86H
Disable Power-up in Standby mode
89H
Disable Address Offset mode
AAH
Enable read look-ahead feature
BBH
4 bytes of ECC apply on Read Long/Write Long commands
C2H
Disable Automatic Acoustic Management
CCH
Enable reverting to power on defaults
DDH
Disable release interrupt
Note: After a power on reset of hard reset the device is set to the following features as default:
Write cache
: Enable
ECC bytes
: 4 bytes
Read look-ahead
: Enable
Reverting to power on defaults
: Disable
Release interrupt
: Disable
11.29.1 Set Transfer mode
When Feature register is 03h (= Set Transfer mode), the Sector Count Register specifies the transfer
mechanism. The upper 5 bits defines the type of transfer and the low order 3 bits encodes 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
)
11.29.2 Write Cache
If the number of auto reassigned sectors reaches the reassignment capacity of the device, the write cache
function will automatically be disabled. Although the device still accepts the Set Features command with
Feature register = 02h without error, the write cache function remains disabled. For current write cache
function status refer to Figure 100 "Identify Device Information" (word 85 or 129) on page 117.
11.29.3 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
11.29.3.1
Low Power Idle mode
Additional electronics are powered off and the heads are unloaded on the ramp.
The spindle is still
rotated at the full speed.
Deskstar 120GXP hard disk drive specifications
154