I've owned a Hyperdrive Colorspace 160GB for a while and have had frequent problems with it, ranging from failure to copy to incompatabilities with simple Ridata 150x cards, to problems with some UDMA cards. My last shoot, I had problems after the second day, and ended up using my slightly older Nexto for the remaining three days. I've sent mine in for repair/replacement several times (they at least have responsive tech/customer support -- Five Stars there), but frankly, I feel it is no longer dependable. I plan to buy a Nexto with an eSATA connection (great, since my notebook has an eSATA/USB port), because I've found their drives more reliable. (For that matter, my Hyperdrive - non-Colorspace is more reliable.) I don't care as much about seeing the downloaded images (rarely if ever use it), so I'm happy to trade that feature for better reliablility.
You might consider the same.