Extended Serial Advanced Technology Attachment is an external interface that is used for the SATA technology. SATA is the disk-interface technology which was developed by a group of the industry’s leading vendors with the aim of replacing traditional parallel SATA technology. Extended Serial Advanced Technology Attachment is an external interface that is used for the SATA technology. SATA is the disk-interface technology which was developed by a group of the industry’s leading vendors with the aim of replacing traditional parallel SATA technology.