Polarity for IOMEGA ix4-200d Power Adapter

Can anyone tell me (ideally LINK me to a document proving) the polarity of the center tip for the Power Supply of an IOMEGA ix4-200d NAS device?  I've got the voltage and amperage, but I can't seem to find polarity...
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Lee W, MVPTechnology and Business Process AdvisorAsked:
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JohnBusiness Consultant (Owner)Commented:
I cannot find any definitive source. Here:

The DC Tip is a barrel tip and the power supply appears to be North American.
All such tips I have seen (lots in my basement here) are all negative barrel, positive tip.
Dr. KlahnPrincipal Software EngineerCommented:
If you have the original adapter, look on the name plate (sometimes this is laser engraved into the plastic and difficult to read).  Sometimes this is also seen next to the DC socket on the equipment itself.

There will be a symbol on it that  looks like the one below:

AC adapter polarity symbols
Chances are it will look like the one on the left, which is tip positive, ring negative.  It's been a long time since I have seen anything else.  The electronics industry has largely standardized on tip positive, ring negative, which is a blessing as it wasn't so long ago when it could be either way, 50/50 chance of blowing up anything a random adapter would fit.
Lee W, MVPTechnology and Business Process AdvisorAuthor Commented:
I don't have the original adapter and all the ebay and other pics blur out the tip polarity.

I took a shot and used an Enercell Laptop Universal Adapter using tip 32 (FWIW).  That worked.  It's the same tip/polarity as Acer Travel Mate 210 (and a 100 other models, give or take), and that worked.  Correct polarity and voltage.

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