Western digital 500gb drive Several months ago, I activated the drive, and successfully transferred files. After several months, I plugged in the drive , drive was recognized. When I attempted to start a "send to drive" session, I get error code 788. The drive has not been used for several months, never used on any other 622 DVR. I do not want to reformat the drive. Why is the drive suddenly not recognized?? Rebooted DVR, rebooted drive, tested with another USB cable. Nothing clears error code 788.