1.8 Error Rate. Fujitsu C141-E090-02EN

Add to My manuals
189 Pages


1.8 Error Rate. Fujitsu C141-E090-02EN | Manualzz

(4) Service life

In situations where management and handling are correct, the disk drive requires no overhaul for five years when the DE surface temperature is less than 48°C. When the DE surface temperature exceeds 48°C, the disk drives requires no overhaul for five years or 20,000 hours of operation, whichever occurs first. Refer to item (3) in Subsection 3.2 for the measurement point of the DE surface temperature.

(5) 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).


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 read retries without user's retry and ECC corrections shall occur no more than 10 times when reading data of 10

15 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

7 seek operations.


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.

1 - 10 C141-E090-01EN


Related manuals

Download PDF


Table of contents