We started our research by buying a number of faulty hard disks and closely examining the modules in the factory or firmware zone of the hard disk. We found that in drives with this problem one of the firmware modules contained a lot more data than on good working drives.
We set about examining this problem more closely and found that resetting the module to default values full access to the data was achieved and the drive was basically repaired but still with some bad sectors. Deeper analysis also reveals that the problem arises when one or more surfaces develop bad sectors and they get added to a Pending or Reallocation list. By examining the logs we can also determine which heads are likely to give problems when reading and so we are able to read the good surfaces first and return to the bad surface once the good ones are copied.
You can contact us for data recovery of your Western Digital hard disk or view more information about our hard disk recovery services.