ESDI Concepts of ESDI - From FreeBSD Handbook. Addresses; physical connections, device addressing and termination. HwB: ESDI Cable by Joakim Ögren - Pinout and description for building an ESDI cable. Halifax Area Personal Computer Society - ESDI drives information. ESDI=Enhanced Small Device Interface - Developed by Maxtor in the early 1980's as an upgrade and improvement to the ST506 design. ESDI