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12.55.1.10 SMART Return Status (Subcommand DAh)
This command is used to communicate the reliability status of the device to the host’s request. Upon receipt of the
SMART Return Status subcommand the device saves any updated Pre-failure type Attribute Values to the reserved
sector and compares the updated Attribute Values to the Attribute Thresholds.
If the device does not detect a Threshold Exceeded Condition, the device loads 4Fh into the Cylinder Low register,
C2h into the Cylinder High register.
If the device detects a Threshold Exceeded Condition, the device loads F4h into the Cylinder Low register, 2Ch into
the Cylinder High register.
Table 229 SMART RETURN STATUS command (B0h-DAh)
Command Input
Field
Description
FEATURE
DAh
COUNT
N/A
LBA
Bit Description
27:24 N/A
23:8 C24Fh
7:0 N/A
DEVICE
Bit Description
7 Obsolete
6 N/A
5 Obsolete
4 Transport Dependent
3:0 Reserved
Command
7:0 B0h
Normal Outputs
Field
Description
ERROR
N/A
COUNT
N/A
LBA
N/A
DEVICE
Bit Description
7 Obsolete
6 N/A
5 Obsolete
4 Transport Dependent
3:0 Reserved
STATUS
Bit Description
7:6 Transport Dependent
5 DEVICE FAULT bit
4 N/A
3 Transport Dependent
2 N/A or ALIGNMENT ERROR bit
1 SENSE DATA AVAILABLE bit
0 ERROR bit
Error Outputs
See Error Outputs in Section 12.12 Idle (E3h / 97h)
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Hard Disk Drive Specification