Cavalry CAXR25160 2.5-Inch 160GB USB 2.0/eSATA External Hard Drive with OTB Cavalry CAXR25160 2.5" 160GB USB 2.0/eSATA Extl HDD w/OTB General Features: 160 GB formatted capacity OTB (One Touch Backup via software) USB 2.0 and eSATA interface 5400 RPM spindle speed Pre-formatted with NTFS Macintosh compatible 480 Mbps data transfer rate (USB 2.0) 3.0 Gbps data transfer rate (eSATA) Slim and lightweight design