Transcends StoreJet 25M3 ruggedised portable hard drive combines supreme shock-resistant qualities with the USB 3.1 Gen 1 interface, allowing for ultra-fast file transfers and the highest level of anti-shock protection. The military green Storejet 25M3 Portable Hard Drive from Transcend is built with 4TB of storage and a USB 3.1 Gen 1 interface that transfers up to 5 Gb/s. This bus-powered hard drive connects to your computer via USB Type-A and keeps data secure with an integrated 256-bit AES file encryption. The Storejet 25M3 is made from military-grade silicone rubber and features a reinforced casing that resists shock in case of accidental drops. The internal 2.5\" hard drive receives further protection from a built-in suspension system alongside its quick reconnect button, which re-enables the disconnected hard drive without having to remove or reinsert the USB cable. Furthermore, the Storejet 25M3s one-touch auto-backup button helps to create a second copy of your data. And if you ever have to switch between systems, you dont have to worry about reformatting since the Storejet 25M3 is compatible with multiple operating systems, including Windows, Mac, and Linux. Moreover, Transcend includes its Elite data management software with the Storejet 25M3, which helps you keep your files organized. Features Three-stage protection system, including an anti-shock silicon rubber outer case, an internal shock-absorbing suspension damper, and a reinforced hard casing. Slim 0.6\" form factor provides convenient storage and portability. Quick Reconnect button safely re-enables the removed hard drive without unplugging and reinsertion. Built-in One Touch Auto-Backup button. Transcend Elite data management software included. System Requirement Operating System: Microsoft Windows 7, Windows 8, Windows 10, Mac OS X 10.7 or later, Linux Kernel 2.6.31 or later. Form Factor 2.5\" HDD Capacity 4TB Power USB 3.1 Gen 1 USB Type Micro USB to USB Type A Weight & Dimensions Weight (max):294g 129.5 mm x 80.8 mm x 24.1 mm (5.10\" x 3.18\" x 0.95\") Operating System Windows 10/8/7/Vista/XP, Mac OS X 10.4.8 or later