You very likely need a new driver, if one is available. A search of the Simpletech site does not indicate there is one, as the drive is indicated as having been compatible with OS's through Windows XP. The driver download page is at http://www.simpletech.com/site_cms/content/support-drivers-software - and as you will see there is no upgraded driver for this hard drive. I would suggest contacting them (there is a link on the same page) to see if one is available, or if there is another workaround.

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Take the unit apart the hard drive has come loose from the socket.
Been there done that, the unit works fine, prior to that it was asking for driver software you don't need for plug and play.