Truelilaznkid

Drives? I have a Western Digital (WD) My Book Essential Edition (320GB)Yesterday, it had a problem and i couldn't open it or do anything. I started up the Data Lifeguard Diagnostic and it fixed it. I was able to access everything. But today this morning, I started up my computer and the hard drive was categorized as USB and the hard drive was missing from My Computer. I couldn't Access it. I tried the Data Lifeguard Diagnostic again and it was categorized as USB and everything was unknown. I don't care if my data was lost, but how can I fix it. I tried the Disk Management, but it couldn't be found. I tried Device Manager, and it was found, but wasn't part of a hard drive.