Geeky Gadgets – IDE to SD Card Adapter
Check out the IDE to SD card adapter.
This SD card adapter connects directly to an IDE cable and you can use an SD card as you OS hard drive.
It is probably not going to be faster than a SATA hard drive, but it will use virtually no power, so it work be a great solution to use in a small Linux PC.
It is available to buy online from gizfever for $24.99 (about £12.50).