1. The adapter cards converts these interfaces to each other, for example, some conversion cards can turn the male head into the female head, and some can turn the 50 pin interface to the 68 pin interface, so that the 50 pin low speed SCSI device can be used on the SCSI interface of the 68 pin. 2. The SCSI interface can transmit data synchronously or asynchronously, the synchronous transmission rate can reach 10MB/s, and the asynchronous transmission rate can reach 1.5MB/s. SCSI SCA 80 Pin to 68Pin to 50 Pin IDE Hard Disk Adapter Converter Card Module Board Compatible: SCA & SCA-2 80-pin Note: It's 50 pins IDE, not 40 pins or 44 pins IDE of ordinary computers. It can't be used on ordinary computers. Color:As Shown Material:PCB Package Contents: 1 * SCSI three-speed card Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.