Of course, these days, you are more likely to find some version of SATA and — lately — NVME connectors. But a standard predating all of this was very common in high-end systems: SCSI.

External connections are also common and typically connect via an external port on a storage controller card using a cable. Within the controller is a memory chip that holds the SCSI BIOS ...

A group of SCSI peripherals daisy chained together. The cable goes from the host adapter into device #1, then from #1 to #2 and so on. See SCSI. THIS DEFINITION IS FOR PERSONAL USE ONLY.