Fujitsu MBA3147RC Manuel D’Utilisation

396 

C141-C013 

This function performs a background task that verifies the entire media surface by 
scanning it during idle time based on the specification on Mode Page 0x1C 
SubPage 0x01 (Background Control mode Page).  During the scan, automatic 
alternate processing is performed based on what is specified by the Retry 
Parameter. This function thus makes it possible to detect sectors early that are 
likely to become bad sectors and take appropriate countermeasures. 

If another command is issued during the scan, that command is executed 
immediately to ensure that the status information during the scan, the LBA that 
encountered the error, and other information can be read on Log Page 0x15. 

The Background Media Scan function can be performed in either of the following 
two modes: 

• 

Background Media Scan (BMS) mode 

• 

Pre-Scan mode 

The subsequent sections explain both modes in detail. 

In this mode, the entire media surface is verified. Once one verification operation 
ends (either normally or midway with an error), a verification operation can be 
repeated after the BMS Interval Time. 

When the previous verification operation ended normally, the next verification 
operation will begin with LBA 0. 

If the previous verification operation ended with an error amid LBAs, the next 
verification operation will begin with the LBA that is next to the LBA that 
encountered the error. 

In this mode, the entire media surface is verified immediately after power-on 
(Spin-Up).  Once a scan ends (with normal end of entire surface verification or 
with an error), a scan in this mode will not begin until the following operation is 
performed: 

1)  The Mode Page EN_PS bit is cleared to '0.' 

2)  The Mode Page EN_PS bit is set to '1.' 

3)  Power on/off is performed.