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5-120 C141-E262
Table 5.34 Features field values and settable modes (2/2)
Features
Field
Drive operation mode
X '88' Undefined (Note 1)
X '8B' Disable Write-Read-Verify feature set. *5
X '90' Disables the Serial ATA function.
X '99' Undefined (Note 1)
X 'AA' Enables the read cache function.
X 'BB'
Specifies the transfer of 4-byte ECC for READ LONG and WRITE LONG
commands. (Note 1)
X 'C2' Disables the Acoustic management function.
X 'CC' Enables the reverting to power-on default settings after software reset. (Note 1)
X 'DF'
Clearing DRQ bit to zero when error bit is set is disabled.
The drive executes the dummy transferring. (Note 2)
Note 1: Although there is a response to the command, nothing is done.
Note 2: Although there is a response to the command and this command reflects on Identify
Device information, DRQ bit is always cleared to zero when error is occurred in PIO
read command (This drive always doesn't the dummy transferring).
At power-on, the default mode is set as follows:
Write cache function: Enabled
Transfer mode: PIO Mode-4, Multiworld
DMA Mode-2
Advanced power management function: Enabled (Mode-1)
Acoustic management function: State keeping
Read cache function: Enabled
At power-on or COMRESET, the default mode of Serial ATA function is set as
follows:
DMA Setup FIS Auto-Activate optimization: Disabled
Device-initiated interface power state Transitions: Disabled
Software Settings Preservation: Enabled