IBM DTLA-305040 Hard Drive Specifications - Page 167

Set Transfer mode, Write Cache, 28.3 Advanced Power Management

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5DH Enable release interrupt 66H Disable reverting to power on defaults 82H Disable write cache 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 ECC bytes Read look-ahead Reverting to power on defaults Release interrupt : Enable : 4 bytes : Enable : Disable : Disable 12.28.1 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) 12.28.2 Write Cache If the number of auto reassigned sector reaches 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, please refer to Identify Device Information (word 85 or 129) by Identify Device command. 12.28.3 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 Deskstar 40GV & 75GXP hard disk drive specifications 155

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5DH
Enable release interrupt
66H
Disable reverting to power on defaults
82H
Disable write cache
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
12.28.1 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
)
12.28.2
Write Cache
If the number of auto reassigned sector reaches 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, please refer to Identify Device Information (word 85 or 129) by Identify Device command.
12.28.3 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
Deskstar 40GV & 75GXP hard disk drive specifications
155