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Serial ATA Flash Drive
AP-SRFD255AXXXXR-G
11
© 2008 Apacer Technology Inc. Rev 0.2 (Preliminary)
recovery is needed, while the first one is not complete, then the new request is converted to a Disk Rebuild
Request.
2.9.2 Disk Rebuild
First of all, the Disk Rebuild is really a Physical Partition Rebuild. Only then the Physical Partition spans the
entire Physical Disk, the entire Physical Disk is rebuilt. Disk Rebuild is a procedure, to copy all of the contents
from the “Good” Physical Partition to the “Broken” or “New” Physical Partition.
This is typically initiated on one of the following three events:
Power Up (Scan if anything is pending)
Physical Disk insertion (Assume, the inserted Physical Disk is good and ready to use).
Another Sector Recovery or Disk Rebuild completes. During Disk Rebuild, the Physical Partition is
not read from, but all writes are propagated to the drive.
2.9.3 Disk Verify
In addition to the Sector Recovery and Disk Rebuild, the Storage Processor also implements a Data
Verification scheme. For sector Recovery, the Data Verification performed by Read-Verify Commands is
automatically and always performed to make sure, the data is written correctly. In case of Disk Rebuild, this
Data Verification is optional (selectable by GPI [1]). The firmware will read the status of this GPI pin and if “1”,
it will perform a Verification cycle. Note: The drive is fully available for reads and writes, during the data
verification process.