I have a WD 640 GB external hard drive for backup and storage. A while back it suddenly did not appear on My Computer as the partitioned drives, although it was recognized in Disk Management. Yesterday I reset the partitions and reformatted both (not the Quick reformat). The two partitions showed healthy in Disk Management and also appeared on my computer. When I did a C:/ drive backup to one of the partitions, the backup ran for about 90 minutes then I got an error saying "Backup did not complete successfully. Internal structure of the PQI file is invalid or unsupported. (0xEA39070A)"
After that, the two partitioned drives onthis disk no longer appeared in either My Computer of Disk Management. Oddly, the external drive did show up when I click the icon int he task bar to Safely Disconnect Hardware.
I need some Geek help on this one.