IBM IC25N020ATDA04 - Travelstar 20 GB Hard Drive Specifications page 178

Output Parameters To The Device
Feature
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 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 in 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.
02H Enable write cache (See note 2)
03H Set transfer mode based on value in sector count register
05H Enable Advanced Power Management
09H Enable Address Offset mode
44H 40 bytes of ECC apply on Read Long/Write Long commands
55H Disable read look-ahead feature
66H Disable reverting to power on defaults
82H Disable write cache
85H Disable Advanced Power Management (See note 3)
89H Disable Address Offset mode
AAH Enable read look-ahead feature
BBH 4 bytes of ECC apply on Read Long/Write Long commands
CCH Enable reverting to power on defaults
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 48GH, 30GN & 15GN hard disk drive specifications
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)
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