ESATA data cables based on 7-pin connectors for Serial ATA transmission. Compatible with SATA1 (1.5 Gb/s) and SATA2 (3.0 Gb/s) standards. Initially the SATA interface was designed to be connected internally to the computer, but soon external uses were found to the computer itself. For this reason, the eSATA (External Serial ATA) standard has been defined, which differs from conventional SATA because it has cables andmore robust and shielded connectors. In addition eSATA allows longer data cable length.