(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)