Bipra 250GB 250 GB USB 3.0 2.5 inch Mac Edition Portable External Hard Drive - Blue - Mac OS Extended (Journaled) Aluminium body for better cooling and protection Formatted in Mac Extended Journaled for you to use on Mac OS only. Hot Swappable and Plug and Play Works with Time Machine software, USB Bus Powered - No External Power Needed, High Speed USB 3.0 (Up to 5Gbps) data transfer rate and backward compatibility USB 2.0 Compact Size, Easily fit in Pocket, 1 Year Warranty With Bipra LLC