Reference Guide - Hard Disk Drives  A Brief History of the Hard Disk Drive Construction and Operation of the Hard Disk Drive Hard Disk Operational Overview Hard Disk Platters and Media Hard Disk Read/Write Heads Hard Disk Head Sliders, Arms and Actuator Hard Disk Spindle Motor Hard Disk Connectors and Jumpers Power Connector Data Interface Connector IDE/ATA Configuration Jumpers SCSI Configuration Jumpers LED Connector Hard Disk Logic Board Hard Disk Cache and Cache Circuitry Hard Disk Form Factors Hard Disk Packaging and Mounting Hard Disk Geometry and Low-Level Data Structures Hard Disk Performance, Quality and Reliability Hard Disk BIOS and Capacity Factors Hard Disk Interfaces and Configuration Hard Disk Logical Structures and File Systems Author: Charles M. Kozierok  Hard disk drives use a standard, 4-pin male connector plug, that takes one of the power connectors coming from the power supply. This keyed, 4-wire plastic connector provides +5 and +12 voltage to the hard disk. A standard hard disk power connector. Note the "4, 3, 2, 1" pin markings on the logic board, and the square shape of solder pad for pin #1. Next: Data Interface Connector

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