The TowerSTOR TS21UT+B Series is a unique external 2.5 SSD/SATA Hard Drive server storage with build-in USB 3.0 and eSATA connection. The combination of fanless design and aluminum housing provide quiet yet cool operation. Fanless design provides whisper quiet operation for studio environment. With support of high performance SuperSpeed USB 3.0 Interface (5Gb/s), as well as eSATA 6G support, TS21UT+B provides the best performance in the market. USB 3.0 and eSATA dual host interfaces are supported for PC, Linux and Mac OS with time machines supported. TS21UT+B is an ideal personal storage for creative professional and personal backup.