Please note: Product needs to be reformatted if it is to be used with Mac. Reformatting the drive will erase all content unless it is backed up to another drive. About capacity: Since the calculation units of hard disk manufacturers and computer operating systems are different, the capacity display will be different. When producing hard disks, the capacity is calculated according to 1G = 1000M = 1000 * 1000K = 1000 * 1000 * 1000BYTE. However, the computer operating system is binary and calculated according to 1G = 1024M = 1024 * 1024K = 1024 * 1024 * 1024BYTE. Easy and simple to use – plug it in and go. Fast file transfers with superspeed USB 3.0. Compatible with USB 3.0 and USB 2.0. Simply plug in the included power supply and USB cable. Automatically recognized by Windows operating system, so there is no software to install or configure needed. Drag and drop file saving, right out of the box. Built-in power management ensures power-saving operation. Please note: Product needs to be reformatted if it is to be used with Mac. Reformatting the drive will erase all content unless it is backed up to another drive. Specifications: Storage capacity: 500G Connection: USB 3.0 Hard drive size: 2.5 inches Max transfer rate: 120MB/s Item size: 11.7 * 8.0 * 1.48cm / 4.60 * 3.14 * 0.58in (L * W * H) Item weight: 170g / 5.99oz Package size: 14.5 * 10.5 * 3.2cm / 5.70 * 4.13 * 1.25in (L * W * H) Package weight: 207g / 7.30oz Package List: 1 * Portable hard drive 1 * USB 3.0 cable 1 * User manual (22 languages)