Also, in theory you could use some kind of adapter and use a regular 3.5" HDD as found in a normal desktop PC (faster, cheaper, much bigger). You'd have to use some kind of separate PSU though. The laptop interface is the same 40 pins as regular IDE but with the four power-pins added onto the end of the cable making 44-pins, (the cable & connector are smaller and thinner though). Also, the laptop drives only use 5volts instead of 5v and 12v for 3.5", but anyway, forgetting the power, the other 40 pins are exactly the same as a regular IDE drive. I haven't seen such an adapter but if you wanted you could botch something up with readily available 2.5" -> 3.5" adapters and cables.