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9.2.6 DEVICE FAULT bit
If the device is in a condition where continued operation may affect the integrity of user data on the device (e.g.,
failure to spin-up without error, or no spares remaining for reallocation), then the device does:
a) return command aborted with the DEVICE FAULT bit set to one in response to all commands (e.g., IDENTIFY
DEVICE commands, IDENTIFY PACKET DEVICE commands) except REQUEST SENSE DATA EXT
commands;
b) complete a REQUEST SENSE DATA EXT command without error with a sense key of HARDWARE ERROR
with additional sense code of INTERNAL TARGET FAILURE (see SPC-4), if:
A) the SENSE DATA SUPPORTED bit is set to one; and
B) the REQUEST SENSE DEVICE FAULT SUPPORTED bit is set to one;
or
c) return command aborted with the DEVICE FAULT bit set to one in response to a REQUEST SENSE DATA
EXT command, if:
A) the SENSE DATA SUPPORTED bit is cleared to zero; or
B) the SENSE DATA SUPPORTED bit is set to one and the REQUEST SENSE DEVICE FAULT
SUPPORTED bit is cleared to zero.
Power cycling the device is the only mechanism that may clear the DEVICE FAULT bit to zero.
If the DEVICE FAULT bit has been cleared to zero, then it may remain clear until a command that affects user data
integrity is received by the device.
9.2.7 DEVICE READY bit
The DEVICE READY bit is transport dependent (see Section 9.2.10). Refer to the applicable transport standard for
the usage of the DEVICE READY bit.
9.2.8 ERROR bit
An ATA device shall set the ERROR bit to one if any bit in the ERROR field (see Section 9.3) is set to one. Otherwise,
an ATA device shall clear the ERROR bit to zero.
9.2.9 SENSE DATA AVAILABLE bit
The SENSE DATA AVAILABLE bit shall be set to one if:
a) the SENSE DATA SUPPORTED bit is set to one;
b) the SENSE DATA ENABLED bit is set to one; and
c) the device has sense data to report after processing any command.
Otherwise, the SENSE DATA AVAILABLE bit shall be cleared to zero.
The ERROR bit and the SENSE DATA AVAILABLE bit may both be set to one.
Bit 1 of the STATUS field is obsolete if:
a) the SENSE DATA SUPPORTED bit is cleared to zero; or
b) the SENSE DATA ENABLED bit is cleared to zero.
9.2.10
Transport Dependent bits and fields
All bits and fields that are labelled transport dependent are defined in the transport standards.
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Hard Disk Drive Specification