I have a Sony Alpha camera that uses CF cards for memory. I don't shoot that much, but the card(s) I'm using a getting a little full. So, I was browsing eBay and I wound up buying 4 innodisk icf9000 industrial cards (4 Gb) for under two bucks apiece. I've seen them some places for anywhere from twenty bucks to almost a hundred. Hmmm..

I plugged them in and formatted them and they seem to work just fine. A google search seems to indicate they are intended as hard disk replacement devices; they seem to be quite fast.

Does any one know more about these things?

Is there any chance I can ruin them/the camera by using them?

Did I get a deal or have I wasted my money?