SCSI Mode Sense Command

SCSI Mode Sense Command

The SCSI Mode Sense command is used to obtain current device information from mode pages in a SCSI target device. There are two different versions of the command, a 6 byte version and a 10 byte version.

The CDB structure for the Mode Sense(6) command is:

The CDB structure for the Mode Sense(10) command is:

The special control fields in the CDB have the following meaning:
*LLBAA - Long LBA Accepted - if "1" then the target is allowed to return parameter data with the LONGLBA bit set to "1"
*DBD - Disable Block Descriptors - if "1" then the target must not return any block descriptors
*PC - Page control -
**00 - return current values
**01 - return changeable values
**10 - return default values
**11 - return saved values
*Page Code - see the separate Wikipedia page for a list of mode pages


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