Tripp Lites U357-025-R is an inexpensive way to create an external USB storage drive ideal for laptop / notebook users. Simply insert any manufacturers SATA 2.5" hard drive ( not supplied ) into the rugged ABS case and plug the included USB 3.0 cable into a computer or hub USB port. Unit is Plug-n-Play...no software to load. At only 5.25"L x 3.25"W x .5"H the U357-025-R travels easily...great for storing large files like photos music movies etc. Compatible with Windows 2000 XP Vista Win7 and Mac OS 9.2 and above. Supports USB 3.0 data transfer rates up to 5Gbps provided the USB source is USB 3.0. Key Features USB 3.0 Transfer rates up to 5Gbps 10X faster than USB 2.0 Create a portable high volume storage device for Laptop / Netbook Fits all manufacturers 2.5" SATA drives SATA I II and III compliant Backwards compatible with USB 2.0 Plug-and-Play No Power Supply required Power / Activity LED Lights Limited Lifetime Warranty Typical Applications Ideal for Laptop / Notebook / Netbook users as an external USB storage device System Requirements Available USB 3.0 "A" ( or USB 2.0 / 1.1 ) Computer or Hub port WIN 2000 XP Vista WIN7 MAC OS9.2 or above Package Includes U357-025-R External Enclosure ( no hard drive supplied ) USB 3.0 Cable User Manual