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Selection of hard disk interface
Generally, only one is installed, and individual ones have special treatment.

Main board IDE interface

There is generally only one IDE interface on the motherboard, and one data cable can hold two hard disks.

SATA interface of motherboard

If the motherboard has SATA interface, only one data cable can be installed, but generally there will be more than two SATA interfaces on the motherboard.

Small computer system interface

Hard disks with SCSI interfaces are mainly used in the server market, and Fibre Channel is only used in high-end servers, which is expensive and not considered.

Usb interface

Each usb can be connected to an external hard disk.

Serial r232 interface

Serial port r232 (generally only one computer) can be connected to an external hard disk, but it needs to be connected to a converter.