Enhanced Small Device Interface [ESDI] is a Hard Disk Drive [HDD] interface used in the 80's and 90's. ESDI was rendered outdated by the introduction of the ATA disk drive interface [IDE]. ESDI had a data rate of 20M Bytes/sec over a 20-pin cable. The data cable and control cable pinout is shown below.
ESDI Status: Withdrawn;
This disk drive interface standard was originally published as X3.170-1990. In 1991, an amendment was approved and the combined documents were identified as X3.170:1990/X3.170a-1991. In 1994, ESDI was reaffirmed as X3.170-1990[1994]/X3.170a-1991[1994]. This standard was withdrawn in April 1999.
| GROUND | 1 | 2 | ~HD SLCT 3 |
| GROUND | 3 | 4 | ~HD SLCT 2 |
| GROUND | 5 | 6 | ~WRITE GATE |
| GROUND | 7 | 8 | ~CNFG/STATUS |
| GROUND | 9 | 10 | ~XFER ACK |
| GROUND | 11 | 12 | ~ATTENTION |
| GROUND | 13 | 14 | ~HD SLCT 1 |
| Key (no pin) | 15 | 16 | ~SECTOR |
| GROUND | 17 | 18 | ~HD SLCT 1 |
| GROUND | 19 | 20 | ~INDEX |
| GROUND | 21 | 22 | ~READY |
| GROUND | 23 | 24 | ~XFER REQ |
| GROUND | 25 | 26 | ~DRV SLCT 0 |
| GROUND | 27 | 28 | ~DRV SLCT 1 |
| GROUND | 29 | 30 | Reserved |
| GROUND | 31 | 32 | ~READ GATE |
| GROUND | 33 | 34 | ~CMD DATA |
| ~DRV SLCTD | 1 | 2 | ~SECTOR |
| ~CMD COMPL | 3 | 4 | ~ADDR MK EN |
| GROUND | 5 | 6 | GROUND |
| +WRITE CLK | 7 | 8 | -WRITE CLK |
| GROUND | 9 | 10 | +RD/REF CLK |
| -RD/REF CLK | 11 | 12 | GROUND |
| +NRZ WRITE | 13 | 14 | -NRZ WRITE |
| GROUND | 15 | 16 | GROUND |
| +NRZ READ | 17 | 18 | -NRZ READ |
| GROUND | 19 | 20 | ~INDEX |
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Design Key words: Floppy Drive, FDD, Disk, Pin Out, Standard, Personal Computer, Bus, PC, Pinouts, Pin Out, Pinout, pins Connector, Signal Names, 2row, Computer Bus, Specification, Spec, IBM Compatible Personal Computer Interface, IC, Physical Interface, Description, Boot Device, Format, peripherals, Header, IDC.
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