Hitachi ULTRASTAR 15K450 HUS154530VLF400 - Manual (Page 31)

Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
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5.0 Data Integrity
The drive retains recorded information under all non-write operations.
No more than one sector can be lost by power down during a write operation while write cache is disabled. If power down
occurs before completion of a data transfer from write cache to disk while write cache is enabled, the data remaining in the
write cache will be lost. To prevent this data loss at power off, the following action is recommended:
• Confirm successful completion of a SYNCHRONIZE CACHE (35h) command
5.1 Equipment Status
Equipment status is available to the host system any time the drive is not ready to READ, WRITE or SEEK. This status nor-
mally exists at power-on time and will be maintained until the following conditions are satisfied:
• Access recalibration/tuning is complete
• Spindle speed meets requirements for reliable operations
• Self-check of drive is complete
Appropriate error status is made available to the host system if any of the following conditions occur after the drive has
become ready:
• Spindle speed goes outside of requirements for reliable operation
• “Write fault” is detected
5.2 Error Recovery Procedure
Errors occurring with the drive are handled by the error recovery procedure.
Errors that are uncorrectable after application of the error recovery procedures are reported to the host system as non-recover-
able errors.