I bought a 5TB Seagate External HD, my second one. The first one I bought was brand new and works fine. Had to format it for Mac. Did so with no trouble. But the second one I bought is used. Disk Utility won't recognize it, i.e. it is not listed in the left panel among the available disks. It is getting power -- it lights up and beeps twice upon plug in. I am using a USB cable that works fine with the other identical HD. The USB cable is plugged directly into the Mac, not through a hub. All other peripherals and external HDs are disconnected. Still, Disk Utility can't see it. Is it possible that a previous owner formatted it in a way that prevents Mac from seeing it? If Disk Utility will not recognize it, what are my other options for formatting the drive for Mac? Thanks.
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