Sata and eSata Cables and Connectors

Serial ATA (SATA) is a computer bus interface that connects host bus adapters to mass storage devices such as hard disk drivesand optical drives. 
eSATA (e standing for external) provides an external connectivity variant of SATA. It uses a more robust connector, longer shielded cables, and stricter (but backward-compatible) electrical standards. The two standards have connectors of different dimensions and are designed to be non-interchangeable