Set Transfer Mode - Western Digital Ultrastar DC HC310 Specifications

11.46.1 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
11.46.2 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.
11.46.3 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
00000
00000
00001
00100
01000
Description
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
Western Digital Hard Disk Drive OEM Specification
000
001
nnn (nnn=000,001,010,011,100)
nnn (nnn=000,001,010)
nnn (nnn=000,001,010,011,100,101,110)
243