![]() When does the Operating System (OS) see medium errors? In some cases, the controller will not be able to handle the medium error and will pass the error to the host to handle the error.Based on the RAID configuration, the controller may be able to handle the medium error reported by the HDD and no further action will be required.The RAID controller will encounter medium errors while Patrol Reads, Consistency Checks, Normal Reads, Rebuilds, and Read / Modify / Write operations.How does the Raid controller detect medium errors? If all the recovery steps fail the drive will generate a 03/11/0x error back to the host and the LBA(s) will be placed on the pending defect list. ![]() When the HDD is unable to retrieve data that was written it invokes the HDD recovery code which will try various error recovery steps to successfully read the data from the media. The HDD tries to read from the media and for some reason is unable to retrieve the data that was written. Step 1.The HDD periodically performs Background Media Scans to detect errors. How does the HDD detect the medium error? ![]() ![]()
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