Interface connector
The interface connector is about data cable. There are two types of interface: IDE interface and SATA interface. The IDE interface is 40pin / 80wire and the SATA is 7pin. SATA is a point-to-point system. In the image below, the red one is the SATA interface and the other is the IDE interface.
Jumpers
Jumpers are only available on IDE drives, not SATA.
In IDEs, the master-slave must be separated when installing the connector. If both HD and CD ROMs are in one IDE cable, the hard disk must be the master and the CD ROM must be the slave. Yes, the pin is now a 40 pin 80 wire, protected from crosstalk, and much faster.
The cable version, called ATA, used to be 66/100 / 133MHz but is now faster because it uses bus mastering technology called ultra DMA.
IDE power cable cables are disconnected while the computer is running.