Installing a second hard drive

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I bought a Compaq computer that came with one DVD drive and 1GB of memory
and one 200GB hard drive.  I soon added a sound card (I didn't like the
integrated one on the mother board), a second GB of memory, thus filling all
the slots, and a second DVD burner.  There's room in the case for a second
hard drive.

I'd like to add this second hard drive.  What I don't know is whether the
existing power supply is adequate for all this extra stuff I'm installing.
There are enough connections from the power supply to handle it all, but I
have no idea what the actual electrical burden will be.   Since no
instructions or specifications came with the computer--not even a backup
disc--how do I find out whether I will need a larger power supply to handle
all this stuff?


Norm Strong

Re: Installing a second hard drive wrote:
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Normally its written on the power supply.   The wattage that is.    I
have a standard 400-450 Watt supply in mine and run 2 CD's and 2 HD's.
The need for power comes from excessive drives and video cards and card
readers etc.   You'll get other opinions but my 4 drives and a floppy
with a video tuner card and USB devices have all been working very well
on my 450 Watt Supply.

Re: Installing a second hard drive

On Thu, 4 Sep 2008 08:44:26 -0700,

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The addition of a single hard drive is a fairly small
change.  Hard drives primarily cause the most current draw
when the system is first turned on, while they're spinning
up simultaneous to inrush current for all the motherboard

If the system turns on and POSTs the odds are you won't have
any problems... though like a candle, your psu will
eventually wear out and the higher the load that's placed on
it, the sooner it will happen.  

It just isn't much of an added load to add the things you
have, any PSU an OEM selected should have had enough reserve
capacity to handle the things you have and want to change.

If you like you could take a multimeter and measure the PSU
voltages to confirm they stay within spec, and run a load
test like Prime95's stress test (or orthos if a 2+ core CPU)
to confirm the system remains stable.

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