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12.49 Set Features (EFh)
Table 206 Set Features Command (EFh)
Command Input
Field
Description
FEATURE
SET FEATURES SUBCOMMAND field
COUNT
Subcommand specific
LBA
Subcommand specific
DEVICE
Bit Description
7 Obsolete
6 N/A
5 Obsolete
4 Transport Dependent
3:0 Reserved
Command
7:0 EFh
Normal Outputs
See Normal Outputs in Section 12.7 Flush Cache (E7h)
Error Outputs
See Error Outputs in Section 12.12 Idle (E3h / 97h)
The Set Feature command is to establish the following parameters which affect the execution of certain features as
shown in below table.
ABT will be set to 1 in the Error Register if the Feature register contains any undefined values.
Subcommands code
Feature
Destination code for this command
02h
Enable write cache
03h
Set transfer mode based on value in sector count register
05h
Enable Advanced Power Management
06h
Enable Power-up in Standby feature set
07h
Power-Up In Standby feature set device spin-up
10h
Enable use of Serial ATA feature
43h
Set Maximum Host Interface Sector Time
4Ah
Extended Power Conditions
55h
Disable read look-ahead feature
5Bh
Repurposing Depopulation (RDP) feature
5Ch
Write Cache Enabled Data Safety
66h
Disable reverting to power on defaults
82h
Disable write cache
85h
Disable Advanced Power Management
86h
Disable Power-up in Standby mode
90h
Disable use of Serial ATA feature
AAh
Enable read look-ahead feature
C3h
Enable/Disable the Sense Data Reporting feature set
CCh
Enable reverting to power on defaults
E0h
Execute RDP Certification for SATA
Note. After power on reset or hard reset, the device is set to the following features as default.
Write cache
: Enable
Read look-ahead
: Enable
Reverting to power on defaults
: Disable
Release interrupt
: Disable
279
Hard Disk Drive Specification