Hard Drive Power Supply

hamburgerheathen · Aug 16, 2015

I have a Hitachi 500 GB external hard drive, and I can't find the power cord. I have a universal adapter that should work perfectly well, except the hard drive only says DC. It doesn't specify voltage and it doesn't specify polarity. I really don't want to fry my hard drive. Does anybody know how to tell voltage and polarity?
Thanks for your help!

Someone Somewhere · Aug 16, 2015

Can you post a picture of the label on the universal adapter, and the label on the HDD?

hamburgerheathen · Aug 16, 2015

https://www.dropbox.com/s/6nwjd4gvac84awn/hitachi.jpg?dl=0 Here is a link to the label on the hard drive. It's hard to see, but the only thing it says under the power supply is DC. No helpful little +(- - symbols. The power supply label is black plastic and isn't going to come out in a picture but I can tell you what it says. It's a Power Line 600 mA Universal Adapter Model 90333. Input: 100-120 VAC 50/60Hz 0.3A max; Vout DC: 3,4.5,6,7.5,9,12; Current 600 mA. It has a voltage selector on the front that ranges from 3 V to 12 V, and a switch for polarity -(+ + and +(- -. Hopefully this helps. Thanks again!

Someone Somewhere · Aug 16, 2015

3.5" HDDs like that almost always use 12VDC centre positive.

However, 600mA isn't going to be enough. Typically you want at least 1.2A, and 2A is better.

hamburgerheathen · Aug 16, 2015

Thanks for your answer! I guess I'll be spending some quality time deep in the lair of the computer cord bin.

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