Seagate ST600MP0064 - 4K ユーザーズマニュアル

S

EAGATE 

E

NTERPRISE 

P

ERFORMANCE 

15K HDD 

AND 

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NTERPRISE 

T

URBO 

SSHD SAS P

RODUCT 

M

ANUAL

, R

EV

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 15

  

Drive Self Test (DST) is a technology designed to recognize drive fault conditions that qualify the drive as a failed unit. DST  validates the 

functionality of the drive at a system level. 

There are two test coverage options implemented in DST:
1. Extended test
2. Short test

The most thorough option is the extended test that performs various tests on the drive and scans every logical block address (LBA) of the 

drive. The short test is time-restricted and limited in length —it does not scan the entire media surface, but does some fundame ntal tests 

and scans portions of the media. 

If DST encounters an error during either of these tests, it reports a fault condition. If the drive fails the test, remove it from service and 

return it to Seagate for service.

The drive will present a “diagnostic failed” condition through the self-tests results value of the diagnostic log page if a fun ctional failure is 

encountered during DST. The channel and servo parameters are not modified to test the drive more stringently, and the number of retries 

are not reduced. All retries and recovery processes are enabled during the test. If data is recoverable, no failure condition will be reported 

regardless of the number of retries required to recover the data.

The following conditions are considered DST failure conditions:
• Seek error after retries are exhausted
• Track-follow error after retries are exhausted
• Read error after retries are exhausted
• Write error after retries are exhausted

Recovered errors will not be reported as diagnostic failures.

This section provides all of the information necessary to implement the DST function on this drive.

The drive must be in a ready state before issuing the Send Diagnostic command. There are multiple reasons why a drive may not b

e ready, 

some of which are valid conditions, and not errors. For example, a drive may be in process of doing a format, or another DST. It is the 

responsibility of the host application to determine the “not ready” cause.

While not technically part of DST, a Not Ready condition also qualifies the drive to be returned to Seagate as a failed drive.

A Drive Not Ready condition is reported by the drive under the following conditions:
• Motor will not spin
• Motor will not lock to speed
• Servo will not lock on track
• Drive cannot read configuration tables from the disk

In these conditions, the drive responds to a Test Unit Ready command with an 02/04/00 or 02/04/03 code.

To invoke DST, submit the Send Diagnostic command with the appropriate Function Code (001b for the short test or 010b for the extended 

test) in bytes 1, bits 5, 6, and 7.

DST has two testing options:
1. short
2. extended

These testing options are described in the following two subsections.

Each test consists of three segments: an electrical test segment, a servo test segment, and a read/verify scan segment.