Output parameters to the device
Feature
Destination code for this command.
Enable reverting to power on defaults
CCH
4 bytes of ECC apply on Read Long/Write Long commands
BBH
Enable read look-ahead feature
AAH
Disable Address Offset mode
89H
Disable Advanced Power Management (See note 3)
85H
Disable write cache
82H
Disable reverting to power on defaults
66H
Disable read look-ahead feature
55H
40 bytes of ECC apply on Read Long/Write Long commands
44H
Enable Address Offset mode
09H
Enable Advanced Power Management
05H
Set transfer mode based on value in sector count register
03H
Enable write cache
(See note 2)
02H
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.
01000 nnn
(nnn=000,001,010,011,100)
Ultra DMA mode x 01000 nnn
00100 nnn (nnn=000,001,010)
Multiword DMA mode x 00100 nnn
00001 (nnn=000,001,010,011,100)
PIO Flow Control Transfer Mode x 00001 nnn
00000 001
PIO Default Transfer Mode,Disable IORDY
00000 000
PIO Default Transfer Mode
When the Feature register is 05h ( = Enable Advanced Power Management) the Sector Count Register
specifies the Advanced Power Management level.
Aborted
00h, FFh
The deepest Power Saving mode is Standby
01h-7Fh
The deepest Power Saving mode is Low power Idle
80h-BFh
The deepest Power Saving mode is Active Idle
C0h-FEh
Note 2. If the number of auto reassigned sectors 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 (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.
Hitachi Travelstar 60GH & 40GN hard disk drive specifications
160
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