If you have an old computer that is toast, an enclosure is a great way to use the HDD from that computer. I bought an enclosure for a 2.5" HDD for about $15 from eBay. Plugs into a USB just like any other. Also bought a 3.5" enclosure for a bigger drive, that enclosure was around $25 if memory serves but came with a wall wart power supply. It's what I use to back up my files.