Sure you can get an external hard drive for portability but ... hard drive is also highly recommended for desktop PCs. The Toshiba L200 is a 2.5-inch 1TB internal hard drive.

TOSHIBA Canvio Ready 1TB Portable External HDD - USB3.0 for PC Laptop Windows and Mac, 3 Years Warranty, External Hard Drive - Black The A-DATA HD770G 1TB portable hard drive comes with a unique ...