Hitachi HTS421212H9AT00 - Travelstar 120 GB Hard Drive Specifications page 178

86H Disable Power-Up in Standby feature set
89H Disable Address Offset mode
4 bytes of ECC apply on Read Long/Write Long commands
BBH
Enable read look-ahead feature
AAH
Disable Automatic Acoustic Management feature set
C2H
Enable reverting to power on defaults
CCH
Note 1. When the 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
When the Feature Register is 05h (=Enable Advanced Power Management) the Sector Count Register specifies the
Advanced Power Management level.
C0h-FEh
80h-BFh
01h-7Fh
00h, FFh
Note 2. If the number of auto reassigned sectors reaches the device's reassignment capacity, the write cache func-
tion will be automatically disabled. Although the device still accepts the Set Features command (with Feature reg-
ister = 02h) without error, the write cache function will remain disabled. For the current write cache function status,
refer to the Identify Device Information (129 word) by the Identify Device command.
Hard reset or power off must not be done during the first 5 seconds after write command completion when write
cache is enabled.
Note 3. When the Feature register is 85h (=Disable Advanced Power Management), the deepest Power Saving
mode becomes Active Idle.
Note 4. When Feature register is 42h (=Enable Automatic Acoustic Management), the Sector Count Register spec-
ifies the Automatic Acoustic Management level.
80h - BFh ... The seek mode is set to Quiet seek mode
C0h - FEh ... The seek mode is set to Normal seek mode
00h - 7Fh,
FFh ...
Invalid setting. The command is aborted When Feature register is C2h (=Disable Automatic Acoustic Manage-
ment), the seek mode is set to Normal mode. The setting is preserved across power cycle. The shipping default is
"Normal seek mode."
bits
(7:3)
00000
00000
00001
00100
01000
The deepest Power Saving Mode is Active Idle
The deepest Power Saving Mode is Low Power Idle
The deepest Power Saving Mode is Standby
Aborted
Travelstar 4K120 Hard Disk Drive Specification
164
bits
(2:0)
000
001
nnn (nnn=000,001,010,011,100)
nnn (nnn=000,001,010)
nnn (nnn=000,001,010,011,100)