(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)