Set Transfer Mode; Write Cache; Serial Ata Feature; Advanced Power Management - Hitachi HDS723020BLA642 Specifications

11.38.1 Set Transfer mode

When 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

11.38.2 Write Cache

If the number of auto reassigned sector 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, but the write cache function will remains disabled. For current write cache function status,
please refer to Identify Device Information (word 85 or 129) by Identify Device command.

11.38.3 Serial ATA Feature

When the Feature register is set to 10h or 90h, the value set to the Sector Count register specifies the specific
Serial ATA feature to enable or disable.
Sector Count Value
01h
02h
03h
04h
06h

11.38.4 Advanced Power Management

When the value in the Feature register is 05h (=Enable Advanced Power Management), the Sector Count
Register specifies the Advanced Power Management level.
FFh --- Aborted
C0 – Feh ---
The deepest Power Saving mode is Normal Idle mode
(the same as Disable Advanced Power Management)
80 – BFh ---
The deepest Power Saving mode is Low power Idle mode
01 – 7Fh ---
The deepest Power Saving mode is Low RPM Idle mode
00h --- Aborted
The idle time to Low power idle mode and Low RPM idle mode vary according to the value in Sector Count
register as follows:
When Low power idle mode is the deepest Power Saving mode,
Y =(x-80h) * 5+120 [sec]
1
Y =N/A(the device does not go to Low RPM idle mode)
2
When Low RPM idle mode is the deepest Power Saving mode and the value in Sector Count register is
between 40h and 7Fh,
120<=Y <=435 [sec] (default: 120 [sec])
1
00000 000
00000 001
00001 nnn
00100 nnn
01000 nnn
Non-zero buffer offset in DMA Setup FIS
DMA Setup FIS Auto-Activate optimization
Device-initiated interface power state transitions
Guaranteed In-Order Data Delivery
Software Settings Preservation
Y
(120<= <=435)
1
Hitachi hard disk drive specifications
196
(nnn=000,001,010,011,100)
(nnn=000,001,010)
(nnn=000,001,010,011,100,101,11
0)
Description