User's Manual

5.3 Host Commands

C141-E262 5-41

(7) EXECUTE DEVICE DIAGNOSTIC (X '90')

This command performs an internal diagnostic test (self-diagnosis) of the device.

The device reports the diagnostic result and status to the host.

Table 5.6 lists the diagnostic code written in the Error field which is 8-bit code.

Table 5.6 Diagnostic code

Code Result of diagnostic

X '00'

X '01'

X '02'

X '03'

X '04'

X '05'

X '06'

Format Unit is not completed.

No error detected.

HDC diagnostic error

Data buffer diagnostic error

Memory diagnostic error

Reading the system area is abnormal.

Calibration abnormal

Note: The device responds to this command with the result of

power-on diagnostic test.

• Error reporting conditions

(1) A SATA communication error occurred (ST = 51h, ER = 14h).

At command issuance (Shadow Block Registers setting contents)

CM 1 0 0 1 0 0 0 0

DH x x x x HD No. /LBA

At command completion (Shadow Block Registers contents to be read)

ST Status information

DH x x x x HD No. /LBA

01H

Diagnostic code