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Basic Definition
SCSI (Small Computer System Interface) is a parallel bus technology that connects multiple devices via a central bus. Its connectors are typically multi-pin designs, with common types including 50-pin Centronics interfaces and 68-pin interfaces.
Main Types
50-pin Centronics Interface: Used for the SCSI-1 standard, supports 8-bit data transfer, with a maximum speed of 5MB/s. Commonly found in early scanners and external devices.
68-pin Interface: Used for SCSI-3 (Ultra SCSI), supports 16-bit data transfer, with speeds up to 40MB/s. Primarily used in RAID arrays.
Internal 50-pin SCSI: Used for SCSI-1/SCSI-2, connecting internal devices such as hard drives and optical drives.
Internal 68-pin SCSI: Used for a proprietary SCSI-2 interface and is relatively rare.

