Western Digital Purple Pro PR22 handleiding
Handleiding
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Product Features
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3.13.5 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.
3.13.6 Defect Management
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.
3.14 Automatic Defect Retirement
The automatic defect retirement feature automatically maps out defective sectors
while reading or writing. If a defective sector appears, the drive finds a spare sector.
The following item is specific to automatic defect retirement on writes (write auto-
relocation):
Data is always written to disk (using automatic defect retirement if required) and
no error is reported.
The following item is specific to automatic defect retirement on reads (read auto-
relocation):
When host retries are enabled, the drive will internally flag any unrecoverable
errors (DAMNF or ECC). This flagging allows subsequent write commands to this
location to relocate the sector only if the sector test fails.
3.14.1 Error Recovery Process
The drive has five means of error recovery:
ECC On-the-Fly
Preamp Thermal Asperity (TA) Compensation
Read/Write Retry Procedure
Extended Read Retry Procedure
ECC On-the-Fly – If an ECC error occurs, the drive attempts to correct it on-the-fly
without retries. Data can be corrected in this manner without performance penalty.
The details of the correction algorithm appear in the next section.
Preamp Thermal Asperity Compensation – A Thermal Asperity (TA) is a baseline shift
in the readback signal due to heating of the magnetoresistive stripe on the head as a
result of physical contact with the disk or a particle. The preamp circuit has the ability
to detect and compensate for thermal asperities. When an error cannot be corrected
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Productinformatie
| Merk | Western Digital |
| Model | Purple Pro PR22 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 4319 MB |