Answer: The eSATA disk interface
Details:
The eSATA interface can provide raw data transfer rates of 6 Gbits/s and data rates of 600 mbps to external devices.
The name eSATA means e (external) SATA connection to devices such as external SATA hard disks drives.
In order to attain 600 mbps, the data transfer protocol requires SATA 3.0 or higher.
SATA stands for Serial ATA or Serial AT attachment.