Internal Environmental Protection System; Recoverable Errors; Unrecoverable Errors; Self Test - Western Digital Purple PR1200M Technical Reference Manual

Product Features
Ducted airflow — Provides protection to the Read/Write element from heated

air.

3.14.3 Internal Environmental Protection System

This dual filter system protects the inside environment of the drive from
contamination. System features include:
Dual Filtration System to ensure fast clean-up times

Directed airflow to maximize mechanical cooling

Increase casting surface area to maximize cooling
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Ducted air flow to protect Read Rite elements from heated air

Breather filter located at low pressure area
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Enhanced heat dissipation


3.14.4 Recoverable Errors

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.

3.14.5 Unrecoverable Errors

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.

3.14.6 Self Test

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.
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Conveyance Test: Quickly identifies issues caused by handling damage.
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Selective Test: Scans host-defined sections of the drive.
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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.

3.14.7 ATA Error Logging

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.
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WD Purple™ PR1200M
2679-800065-A03