Fujitsu MPB3052AT User Manual download pdf (Page 25)

C141-E045-02EN1 - 10

(4) Data assurance in the event of power failure

Except for the data block being written to, the data on the disk media is assured in the event of

any power supply abnormalities. This does not include power supply abnormalities during

disk media initialization (formatting) or processing of defects (alternative block assignment).

1.8 Error Rate

Known defects, for which alternative blocks can be assigned, are not included in the error rate

count below. It is assumed that the data blocks to be accessed are evenly distributed on the

disk media.

(1) Unrecoverable read error

Read errors that cannot be recovered by maximum 126 times read retries without user's retry

and ECC corrections shall occur no more than 10 times when reading data of 10

bits. Read

retries are executed according to the disk drive's error recovery procedure, and include read

retries accompanying head offset operations.

(2) Positioning error

Positioning (seek) errors that can be recovered by one retry shall occur no more than 10 times

in 10

seek operations.

1.9 Media Defects

Defective sectors are replaced with alternates when the disk is formatted prior to shipment

from the factory (low level format). Thus, the host sees a defect-free device.

Alternate sectors are automatically accessed by the disk drive. The user need not be concerned

with access to alternate sectors.

Chapter 6 describes the low level format at shipping.

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Fujitsu MPB3052AT User Manual Page 25