To list common mode parameters of a disk, enter:
# sdparm /dev/sda
To list the designators within the device identification VPD page of a disk:
# sdparm --inquiry /dev/sdb
To see all parameters for the caching mode page:
# sdparm --page=ca /dev/sdc
To set the "Writeback Cache Enable" bit in the current values page:
# sdparm --set=WCE /dev/sda
taken: http://www.cyberciti.biz/tips/sdparm-li ... ibute.html
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