I've been having a problem with an eSATA drive a bought a couple of months ago. It worked fine for a few days but hasn't since. I thought it was the HR20 because it stopped working the same day that a software upgrade was installed, but it doesn't work with any of my three HR-20's. It could be the enclosure because my PC doesn't seem to recognize the drive when I connect externally but it recognizes it when I install it internally. In the meantime (until I get another enclosure to test) is there something I should do such as reformatting the drive to try it again? It's a 750GB drive and shows 3 partitions: 518MB, 15GB and 683GB.