Hitachi HUS154530VLF400 User Manual

                   

Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification

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•PERF (Performance) bit is not supported and is ignored.  Informational Exception operations will not cause performance 

delays.

• EBF (Enable Background Function) bit is not supported and is ignored.  Background functions are always enabled.

• EWASC (Enable Warning ASC) bit of zero indicates that Temperature Warnings will not be reported.  An EWASC bit of 

one allows Temperatuer Warnings to be reported, if the temperature inside the disk enclosure exceeds the threshold 
set in Mode Page 00h.  The Method of Reporting field controls the reporting method.  EWASC is independent of 
DEXCPT.

• DEXCPT (Disable Exception Control) bit of zero indicates information exception operations are enabled. The reporting 

of information exception conditions when the DEXCPT bit is set to zero is determined from the Method of Reporting 
field. A DEXCPT bit of one indicates the Target disabled all information exception operations. 

• TEST bit of one instructs the drive to generate false drive notifications at the next interval time, (as determined by the 

INTERVAL TIMER field), if the DEXCPT is zero. The Method of Reporting and Report Count would apply. The 
false drive failure is reported as sense qualifier 5DFFh. The TEST bit of zero instructs the drive to stop generating 
any false drive notifications. 

• Enable Background Error (EBACKERR) bit of zero disables reporting of background self-test errors and background 

scan errors via Information Exceptions Control.  An EBACKERR bit of one enables reporting of these background 
errors.  The method of reporting these errors is determined from the MRIE field.

• LOGERR (Log Errors) is not used and ignored internally by the Target.