ESDI 接口
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ESDI 是 Enhanced Small Device Interface 的(de)縮寫，早在 1980 年由 Maxtor 公司開發，是老式硬盤的(de)接口，它的(de)電纜由兩部分(fēn)組成，ESDI 接口在接口卡側的(de)外觀爲 34 腳和(hé) 20 腳公插針：
在硬盤側爲 34 腳的(de)控制信号和(hé) 20 腳數據信号：
| 引腳定義 |
34 腳的(de)控制信号：
| Pin | Name | Description |
|---|---|---|
| 2 | Head Sel 3 | |
| 4 | Head Sel 2 | |
| 6 | Write Gate | |
| 8 | Config/Stat Data | |
| 10 | Transfer Acknowledge | |
| 12 | Attention | |
| 14 | Head Sel 0 | |
| 16 | Sect/Add MK Found | |
| 18 | Head Sel 1 | |
| 20 | Index | |
| 22 | Ready | |
| 24 | Transfer Request | |
| 26 | Drive Sel 1 | |
| 28 | Drive Sel 2 | |
| 30 | Drive Sel 3 | |
| 32 | Read Gate | |
| 34 | Command Data |
20 腳的(de)數據信号：
| Pin | Name | Description |
|---|---|---|
| 1 | Drive Selected | |
| 2 | Sect/Add MK Found | |
| 3 | Seek Complete | |
| 4 | Address Mark Enable | |
| 5 | (reserved, for step mode) | |
| 6 | GND | Ground |
| 7 | Write Clock+ | |
| 8 | Write Clock- | |
| 9 | Cartridge Changed | |
| 10 | Read Ref Clock+ | |
| 11 | Read Ref Clock- | |
| 12 | GND | Ground |
| 13 | NRZ Write Data+ | |
| 14 | NRZ Write Data- | |
| 15 | GND | Ground |
| 16 | GND | Ground |
| 17 | NRZ Read Data+ | |
| 18 | NRZ Read Data- | |
| 19 | GND | Ground |
| 20 | GND | Ground |