Set Features (X 'Ef'); Table 5.34 Features Field Values And Settable Modes - Fujitsu MHW2120BK Maintenance Manual

(28) SET FEATURES (X 'EF')

The host system issues the SET FEATURES command to set parameters in the
Features field for the purpose of changing the device features to be executed.
Upon receipt of this command, the device sets the parameters in the Features field,
then reports the status to the host system.
If the value in the Features field is not supported or it is invalid, the device posts
an ABORTED COMMAND error.
Table 5.34 lists the available values and operational modes that may be set in the
Features field.

Table 5.34 Features field values and settable modes (1/2)

Features
Field
X '02' Enables the write cache function.
X '03' Set the data transfer mode.
X '04' Enables the automatic reassign. (Note 1)
X '05' Enables the advanced power management function.
X '06' Enables the Power-Up In Standby function. (Note 1)
X '07' Spin up the Power-Up In Standby status device. (Note 1)
X '0B' Enable Write-Read-Verify feature set (Optional)
X '10' Enables the Serial ATA function.
X '33' Undefined (Note 1)
X '42' Enables the Acoustic management function.
X '54' Undefined (Note 1)
X '55' Disables the read cache function.
Clearing DRQ bit to zero when error bit is set is enabled.
X '5F'
The drive does not execute the dummy transferring. (Note 2)
X '66' Disables the reverting to power-on default settings after software reset. (Note 1)
X '77' Undefined (Note 1)
X '81' Disables the 8-bit data transfer. (Note 1)
X '82' Disables the write cache function.
X '84' Enables the automatic shift. (Note 1)
X '85' Set the advanced power management mode to Mode-0.
X '86' Disables the Power-Up In Standby function. (Note 1)
C141-E261
Drive operation mode
5.3 Host Commands
*1
*2
*5
*3
*4
5-119