Hitachi HUS154530VLF400 User Manual

                   

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

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• Suspend On Log Full (S_L_FULL) bit set to zero allows background scans to continue if the results log (Log Sense 

Page 15h) is full.  S_L_FULL bit set to one will cause background scans to suspend when the log is full.

• Log Only When Intervention Required (LOWIR) bit set to zero allows logging of all medium errors in the results log 

(Log Sense Page 15h).  When the LOWIR bit is set to one, only unrecovered medium errors will be logged.

• EN_BMS (Enable Background Medium Scan) bit set to zero specifies that the background medium scan is disabled.  

EN_BMS bit set to one specifies that background medium scan operations are enabled.  If a background medium 
scan is in progress when the EN_BMS bit is changed from one to zero, then the medium scan shall be suspended until 
the EN_BMS bit is set to one, at which time the medium scan shall resume from the suspended location.

• EN_PS (Enable Pre-Scan) bit set to zero specifies that the pre-scan is disabled.  If a pre-scan operation is in progress 

when EN_PS is changed from a one to a zero, then pre-scan is halted.  An EN_PS bit set to one specifies that a pre-
scan operation is started after the next power-on cycle.  Once this pre-scan has completed, another pre-scan shall not 
occur unless the EN_PS bit is set to zero, then set to one, and another power-on cycle occurs.

• Background Medium Scan Interval Time specifies the minimum time, in hours, between the end of one background 

medium scan operation and the start of the next background medium scan operation.  The BMS Interval Time shall 
occur before the initial background medium scan operation is started. 

• Background Pre-Scan Time Limit specifies the maximum time, in hours, for a pre-scan operation to complete.  If the 

pre-scan operation does not complete within the specified time, then it is halted.  A value of zero specifies an unlim-
ited time limit.

• Minimum Idle Time Before Background Scan specifies the minimum time, in milliseconds, that the drive must be idle 

before resuming a background media scan or pre-scan.  A value of zero will be treated as the default value of 1.0 sec-
ond.  Any value less than 100 milliseconds will be treated as 100 milliseconds.  The internal timer granularity is 50 
milliseconds.

• Maximum Time To Suspend Background Scan specifies the maximum time, in milliseconds, that the drive should 

delay before processing a new command while background scanning is in progress.