The S2510PESAT External Hard Drive Enclosure can be connected through Power eSATA (also known as eSATA + USB 2.0 USB/eSATA combo) - a single combined eSATA data connection and 5v power connection (over a built-in USB connection) making it easier than ever to turn your 2.5in SATA hard drive into the perfect portable storage solution! The enclosure can also be connected through individual USB 2.0 and eSATA cables to accomodate conventional eSATA host connections. Ideal for storing large digital multimedia files or other demanding applications the external HDD enclosure supports a maximum eSATA/Power eSATA data transfer rate of 3Gbps. Alternatively the enclosure can be connected through USB 2.0 with support for data transfer rates of up to 480Mbps.