Hitachi 7K100 - Travelstar - Hard Drive Specifications page 170

86H Disable Power-Up in Standby feature set
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 feature set
CCH Enable reverting to power on defaults
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 00000
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.
bits (7:3)
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 7K100 Hard Disk Drive Specification
156
bits (2:0)
000
001
nnn (nnn=000,001,010,011,100)
nnn (nnn=000,001,010,011,100)
nnn (nnn=000,001,010,011,100,101)