What are SCSI connectors?
SCSI, or Small Computer Systems Interface, is technology designed to connect smaller devices to a computer. SCSI is bus technology, which means that all devices connect to a central bus and are "daisy-chained" together. The SCSI bus is controlled by a host controller which will typically be built into the motherboard, or it can be from a separate expansion card. Either external or internal, the cabling/connector requirements for an SCSI connector depend upon the location of the bus. SCSI uses three different signaling types, Single-Ended (SE), Differential (HVD or high-voltage differential), and LVD (or low-voltage differential). The most important things to remember when selecting your SCSI cable is the type of connector required by your devices, and if the location of the cable is internal or external.
VHDCI 0.8mm 68-Pin
The Very High-Density Cable Interconnect (VHDCI) 0.8mm 68-pin connector has 68 pins arranged in two rows, one on top of the other. The top row has 34 pins, and the lower row has 34 pins, closely resembling that of a Centronics type interface. This connector is typically used in SCSI-3 applications such as RAID.
Micro DB68
The Micro DB68 or MD68 connector has 68 pins arranged in two rows of 34 pins, one on top of the other. This connector is typically used in SCSI-3 applications such as scanners, removable storage drives, controllers, external CDR/CDRW, and Ultra/2. This connector is also known as High-Density, or HD 68, and Half-Pitch, or HP68.
Micro DB50
The Micro DB50 or MD50 connector has 50 pins arranged in two rows of 25 pins, one on top of the other. This connector is typically used in SCSI-2 applications such as scanners, removable storage drives, controllers, and external CDR/CDRW. This connector is also known as High-Density, or HD50, and Half-Pitch, or HP50.
