Hitachi IC25N040ATCS04-0 - Travelstar 40GN 40GB UDMA/100 4200RPM 2MB 2.5" IDE Hard Drive Specifications page 173

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