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12.36 Request Sense Data Ext (0Bh)
The Request Sense Data Ext command allows devices to report additional error or non-error informational status.
When sense data is available, the sense key (K), additional sense code (C), and additional sense code qualifier (Q)
fields are set (See Section 13).
The default reporting for the Sense Data Reporting feature set is enabled.
The device maintains only the most recent sense data. If more than one reportable event has occurred before the
host issues this command, then the device returns the most recent sense data.
The sense data stops being available to be returned by this command after:
a) receiving any reset;
b) acceptance of a command other than Request Sense Data Ext command that does not read the NCQ
Command Error log; or
c) completion of a Request Sense Data Ext command.
Sense data contains:
a) current information sense data (i.e., with the DEFERRED ERROR bit cleared to zero); or
b) deferred error sense data (i.e., with the DEFERRED ERROR bit set to one).
Current information sense data is sense data associated with the command for which the device has:
a) returned command completion with an error; and
b) set the SENSE DATA AVAILABLE bit to one.
Deferred error sense data is sense data not associated with the command for which the device has:
a) returned command completion with an error; and
b) set the SENSE DATA AVAILABLE bit to one.
Deferred error sense data is sense data:
a) for a previous command for which the device returned command completion without an error; or
b) associated with:
A) multiple commands for which the device returned command completion without an error; or
B) no specific command.
Table 185 Request Sense Data Ext command (0Bh)
Command Input
Field
Description
FEATURE
Reserved
COUNT
Reserved
LBA
Reserved
Bit Description
7:5 Obsolete
DEVICE
4 Transport Dependent
3:0 Reserved
Command
7:0 0Bh
255
Hard Disk Drive Specification