Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Simply Does Not Work

I bought this new with two brand new 200 gig hard drives and set it up with drive mirroring to back up the data automatically. This worked great for about a week. Then drives would disappear from one computer, but be visible from another computer. I tried all the fixes noted on the Netgear website and the only thing that worked was editing the registry and re-installing the drives. That fixed the problem for a week or two, then a drive would mysteriously vanish from another computer. The last straw was when all the information mysteriously vanished from one of the drives and the Netgear utilities were not able to recover any data despite the fact that the drives were mirrored. This product operates on a totally different file structure than Windows, so without the provided software, there is absolutely no way to access or recover lost files.