Internal Environmental Protection System; Recoverable Errors; Unrecoverable Errors; Self Test - Western Digital scorpio black MX375M Technical Reference Manual

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Table Of Contents

Table of Contents

Product Features

3.6.3

This system protects the inside environment of the drive from contamination. System features include:

Filtration System to ensure fast clean-up times

Directed airflow to maximize mechanical cooling

Increase casting surface area to maximize cooling

Ducted air flow to protect read/write elements from heated air

Breather filter located at low pressure area

Enhanced heat dissipation

3.6.4

A sector marked for repair is written back to the same location. The sector is then read several times to

be sure that it was written correctly and that there is no media damage at its location (sector test). If the

sector does not easily and consistently read correctly, the sector is then relocated with original data.

3.6.5

If an unrecoverable error is found during the offline scan, the sector is marked. Future reads from this

location will continue to perform full error recovery. However, the next write to this location will

perform a sector test to be sure the media is not damaged, and the sector relocated if the sector test fails.

3.6.6

Self Test is a quick way to determine the operation status of a drive. The following Self Tests are

supported:

Quick Test: Completes in less than two minutes.

Extended Test: Tests all the critical subsystems of the drive.

Conveyance Test: Quickly identifies issues caused by handling damage.

Selective Test: Scans host-defined sections of the drive.

The test may be run to completion or be performed as a background task as the drive processes other

commands from the host. The host may then poll the drive for runtime status and test results. Since the

test is embedded in the drive's firmware, it is always available, requires no installation and can be faster

and more effective than a software-based drive test.

3.6.7

ATA Error Logging provides an industry standard means to record error events and supporting

information that is then accessible by the host. The event record includes the exact command that

caused the failure, the response of the drive, the time of the event and information about the four

commands immediately prior to the errant command. Error Logging can reliably and quickly

determine whether a system problem is the result of a hard drive failure or other component

malfunction. Error Logging retains total error count for the life of the drive and complete records for

the last five errors.

3.6.8

Every WD drive undergoes factory-level intelligent burn in, which thoroughly tests for and maps out

defective sectors on the media before the drive leaves the manufacturing facility. Following the factory

tests, a primary defect list is created. The list contains the cylinder, head, and sector numbers for all

defects.

Defects managed at the factory are sector slipped. Grown defects that can occur in the field are mapped

out by relocation to spare sectors on the inner cylinders of the drive.