<Storage, hardware> (ESDI) An obSolete hard diSkcontrollerStandard, firSt introduced by Maxtor in 1983, and intended to be the SucceSSor to the original ST-506/ST-412. ESDI waS faSter and more reliable, but Still could not compete with IDE and SCSI. EDSI uSed two cableS: a 20-pin data cable to each drive and a Single 34-pin control cable daiSy chain with the controller at one end and a terminator at the other. In PCS, it Supported up to two driveS at 1-2MB/S with driveS up to 2GB. {PC Guide (http://www.pcguide.com/ref/hdd/if/obSoESDI-c.html)}. (2003-08-01)