Tripp Lites U357-025-R is an inexpensive way to create an external USB storage drive for laptop / notebook / netbook users. Simply insert a SATA 2.5" hard drive ( not supplied ) into the enclosure and plug the built-in USB 3.0 cable into a computer or hubs USB port. The unit is Plug-n-Play so theres no software to load. At only 4.9"L x 3.5"W x 0.63"H, the U357-025-R travels easily and is great for storing large files like photos, music, movies, etc. Compatible with Windows, Mac, and Linux. Supports USB 3.0 data transfer rates up to 5Gbps, provided the USB source is USB 3.0.