External WD Passport won't recognize after Time Machine start.

I bought a WD passport 500 gb drive and when I initially plugged it in time machine saw it and when I asked it to use it- something happened and now NO icon appears in order to be selected nor does an icon show anywhere to even select. I changed the drive and the new one does the same. Cycles continously and never mounts. Did the usual- changed ports and changed wires. It just isn't recognized no matter what. What to do?

jimmyb12015 wrote:
No. The drive is not reflected in any window. Not on my computer or disk utility. It initially was shown just before Time Machine started. It was then I escaped from time machine and I eventually returned the first drive after reformating it to fat 32 (on a windows machine) and it still wouldn't show up the MAC. The second drive now does the same as the first (doesn't show and cycles) but never showed up in any form on the MAC.
If the MAC has a register then my guess is some information about any external disk has been altered and I should need to to return it to it's original setting. That is because the second drive is doing the same as the first. I just don't know how to do that or even look.
If it uses the MBR (Master Boot Record) partition scheme, for Windoze, TM may have started to reformat it to GUID, but had that interrupted when you cancelled. If DU can't see it at all, there's not much you can do from your Mac. You may need to reformat it on a PC, then do it over on your Mac, via item #5 in the FAQ.
There are reports of problems with some WD drives having not working well on Macs. You might want to check their website support/forums, etc.

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KTM450rider wrote:
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External WD Passport won't recognize after Time Machine start.

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