My WD TV media player won't read the files on my iomega hard drive

WD Legacy Products WD TV Media Player
1

I have no problem playing files off my flash drives but when I plug in my portable hard drive it won’t show the files on it yet at the top of the screen it says iomega HD

3

Page 210, WDTV Manual, “troubleshooting” section, USB device; the media library process failed:

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