WD Elements 500 GB USB 2.0 Portable External Hard Drive - Manufacturer Refurbished Like New Condition!! 6 Month Warranty from Western Digital Easy to Use - Just plug it in and it's ready to receive your data USB Powered - These drives require no power adapter Compact Design - Weighing in at only a few ounces, these tiny drives fit easily into pocket or purse Designed for use with Windows-based computers. Can be easily reformatted for use with Macs.