Last spring I purchased a 100 GB Hyperdrive HD80. This unit backs up CF cards very quickly, uses four AA batteries and can back up quite a few cards before the batteries need to be recharged. It does not display images, but seemed to be a good solution for the job of saving images in the field so they could later be downloaded with a fast USB connection to my computer.
The first problem occured when I got a Sandisk Extreme III 4 gb CF card. This card will hold about 400 RAW images, but the Hyperdrive stalls after about 200 images and will not download the rest of the files. I thought maybe it had been formatted in FAT16 with a 2 GB directory limit, but that was not the case. It will download a full 4 GB Hitachi microdrive. I emailed Hyperdrive to see if they had any suggestions to correct this problem. I did not receive any reply so I limited myself to just using it with 2 GB CF cards and microdrives.
Problem number two occured while I was on my trip to Africa. My daughter used my spare camera with an old IBM 1 GB microdrive. I put the microdrive in the Hyperdrive to download, but it seemed to be a little thicker than other cards/microdrives and twisted a bit as it went in. This bent a couple of the pins in the Hyperdrive so that I could not download any more cards or microdrives. (Fortunately I had enough large capacity CF cards and microdrives with me the I could switch to shooting JPEG and was able to shoot the rest of my trip.) The slot where the cards fit in is much shallower in the Hyperdrive than on any other CF card reader I have ever used. This appears to be a design flaw because a card can twist and bend the pins if you are not very careful or if the card binds for some reason on the way in.
Problem number three occured when I got home. I connected the Hyperdrive to my computer with a USB cable and turned on the power. The computer would not recognize the hard drive in the Hyperdrive. I tried several things to get it working including trying to plug it in instead of battery power and disassembling to check that the hard drive was plugged in correctly within the unit. You could hear the drive turning, but I could not access it. It appeared that I had lost the first week and half of my trip. I finally took the Hyperdrive to a computer technician who worked for 3/4 of and hour, charged me $80 CDN and managed to download the images and burn them onto a couple of DVD's for me. He says the Hyperdrive unit is toast, but that the Samsung hard drive is still good.
I don't know whether there is any warranty on the Hyperdrive or not, but I don't want it replaced anyway. I would not trust my images to this device again.