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The power connector was typically the same 4-pin female Molex connector used in many other internal computer devices. The communication connectors on the drives were usually a 50 (for 8-bit SCSI) or 68 pin male (for 16-bit SCSI) " IDC header " which has two rows of pins, 0.1 inches (2.54 mm ) apart.
The de facto standard for 3.5 inch drives uses a 34-pin header mating to an IDC Berg connector, collectively slightly smaller than the PCB edge pin connector and mating socket used for the 5¼ inch standard but with the same 34 pin definitions as the 5¼ inch standard. [7] A separate connector is provided for DC power. [1]
The host adapter grounds this pin; if a device sees that the pin is grounded, it becomes the Device 0 (master) device; if it sees that pin 28 is open, the device becomes the Device 1 (slave) device. This setting is usually chosen by a jumper setting on the drive called "cable select", usually marked CS , which is separate from the Device 0/1 ...
4 or 8 with dual connector (single connector pictured) Mini-SAS HD (introduced with SAS 12 Gbit/s) Sideband connector internal Often seen with 1× SFF-8643 or 1× SFF-8087 on the other end – internal fan-out for 4× SATA drives. Connects the controller to drives without backplane or to the (SATA) backplane and optionally, to the status LEDs.
The power connector on the 3½-inch floppy drive, informally known as "the Berg connector", is 2.50 mm pitch (distance from center to center of pins). The power cable from the ATX power supply consists of 20 AWG wire to a 4-pin female connector. [1]
In 20/24-pin configurations, the Mini-Fit Jr. connector (Molex Mini-fit Jr. 39-28-1203, [7] former 5566-20A or 39-28-1243, [8] former 5566-24A) may be used on ATX motherboards as the main power connector. The same style of connector, in single or paired 4-, 6-, or 8-pin configurations, may be used for additional CPU power and graphics card ...