External Hard drive No Longer Readable by Macbook Pro

I've been using a PQI Portable HD 551 external drive to back up my files for some time now. I haven't backed up since 9/21/12 and I tried to today and got the error message "The disk you inserted was not readable by this computer." I've had no problems with the disk since I reformatted it for Macs, so I'm not sure what the problem is. The USB outlet works for my other external harddrive just fine.

Have you tried checking with the external drive's manufacturer's web support site for FAQs, updated drivers or firmware?

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    Reset the SMC and NVRAM:
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