Archgon 1TB Aluminum Ultra Slim Portable Hard Drive for Mac HFS+ Format, Optimized for UASP mode (Classic Black) Buy with confidence: Build with original Western Digital 1TB drive model WD10SPCX inside Better performance. Optimized for UASP mode. 70% faster than USB 3.0 HFS+ journalized. Works right out of the box with your Mac Compatible with Apple Time Machine Ultra slim 0.37 inches height. Premium solid aluminum case. 3 years limited warranty