Enhanced Small Device Interface
Hard disk drive standard created in mid-1980’s by a consortium of manufacturers leaded by Maxtor. The idea was to create a hard disk standard more reliable than ST-506.
ESDI hard disk drives had a certain level of control embedded on the hard drive itself.
The main problem was that this standard continued to have a controller board outside the hard disk drive, not solving the biggest issue regarding ST-506 standard.
Since IDE standard was created around the same time and on IDE hard disk drives the controller board was embedded on the drive logic board, it was a far better solution than ESDI standard.
Its cable system is equal to ST-506: it uses a 34-wire flat cable for data and a 20-wire flat cable for control.
The maximum transfer rate of this standard was 24 Mbps (megabit per second) or 3 MB/s.
This standard wasn’t widely used.