Some data of electricity usage for PC system parts -
 (The bigger value, the more power consuption !)

   Energy Category 5v DC      12v DC(Direct Current)
IDE Devices	---------    ---------
 CD-ROM drive
     2X 	  900 ma      1500 ma (milli-ampere)
     4X 	  400 ma      1200 ma
     8X 	  350 ma      1700 ma
		 1000 ma       800 ma
    32X 	 1300 ma       800 ma
		  600 ma      1900 ma
    44X 	 1000 ma      1000 ma

 Hard Disk drive
   WD1.6/2.5GB	  400 ma       270 ma
   WNR 1.6GB	  475 ma       200 ma
   Qtm 2~13GB	  650 ma       720 ma
   Sgt 6.5GB	  600 ma       800 ma (7200 rpm)

 Cooling fans mostly use 12v DC -
    CPU: 60~100 ma
    Power Supply Unit: 150~200 ma
    chassis: 160~ ma

============================================================
Nowadays popular PC equipped with two types of power supply:
AT or ATX.  Their pin assignments as --

AT : 12 pins			 ATX: 20 pins

     Power Ground		 1~2  3.3v
     + 5v			   3  Ground
 P8  +12v			   4  + 5v
     -12v			   5  Ground
     Ground			   6  + 5v
     Ground			   7  Ground
				   8  Power OK
     Ground			   9  5VSB(StandBy)
     Ground			  10  +12v
 P9  - 5v			  11  3.3v
     + 5v			  12  -12v
     + 5v			  13  Ground
     + 5v			  14  PS-on
			       15~17  Ground
				  18  - 5v
			       19~20  + 5v


Once not needed,
take the CD off cd-rom drive,
will save more energy (and your money)!

Power bar can be made with many switches,
each corresponds to every plug-in socket,
so avoid unnecessary energy waste.
  Date: 1999/Oct/25