PC Power Connectors (used inside the pc case)
  There are two main power connectors used within the PC. These are used to provide power to a whole range of drives and additional internal peripherals. These include floppy disk drives, hard disk drives, CD/DVD Drives and tape streamers. They use a connector called a Molex for the larger drives and a mini molex for smaller ones , in particular the floppy disk drive.

3.5" Floppy Disk Drive Connector

 

 
Pin Name   Color Description
1 +5V   Red +5 VDC
2 GND   Black +5 V Ground
3 GND   Black +12 V Ground
(Same as +5 V Ground)
4 +12V   Yellow +12 VDC


4 pin Mini Molex Connector

 
  5.25" Floppy Drive / Hard Disk Drive and Misc Peripheral Connector  
 
Pin Name   Color Description
1 +12V   Yellow +12 VDC
2 GND   Black +12 V Ground
(Same as +5 V Ground)
3 GND   Black +5 V Ground
4 +5V   Red +5 VDC


4 Pin Molex
Connector

 
     
     
     
     
 

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