Enhanced Small Disk Interface
<storage, hardware> (ESDI) An obsolete hard disk controller standard, 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)}.
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