hdd voltage

Chuck Swiger cswiger at mac.com
Tue Nov 17 20:48:28 UTC 2009


On Nov 17, 2009, at 12:28 PM, Polytropon wrote:
> V12N  :  +0.97	<----- Reference -12.0 Volt
> V50N  :  +1.99	<----- Seems to be reference -5.0 Volt, but looks  
> strange
> As you can see in relation to your output, your board seems
> to put other values on the "default" named output lines, e. g.
> V12N = +1.46 V which can't be right, but "V12N" seems to be
> some chosen name for one of the data output lines, nothing
> more; it could be called "Bob", too. :-)

V12N is pin 14 of the 20-pin ATX connector, and is supposed to be the  
blue wire, running at -12 VDC.  It was used by ISA cards and an  
optional part of PCI bus interface, but is not normally used by  

V50N is / was pin 20 of the ATX connector, running at -5 VDC, but has  
been removed since ~2003; the -5V rail was used ISA cards, but is now  
obsolete, and pin 20 is prohibited from being present in modern PSUs.


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