Fujitsu MJA2500BH Maintenance Manual - Page 194
Disables the Serial ATA function., DMA Setup FIS Auto-Activate optimization
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Interface 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: Transfer mode: Advanced power management function: Acoustic management function: Read cache function: Enabled PIO Mode-4, Multiworld DMA Mode-2 Enabled (Mode-1) State keeping 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 5-120 C141-E293