Polarity of HP external hard drive

I'm trying to find the polarity of my western digital "My Book" external hard drive 500 GB. It isn't shown on the drive nor does the literature show it
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More about polarity external hard drive
  1. Unless you have lost the power supply, you could either read what is stamped on the outside of said power supply or attach a multimeter to it.

    Again "unless you have lost the power supply," why do you need to know this? Not challenging you, I'm just curious.
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