MacBook Pro :: Doesn't Recognize External Harddrive

Mar 6, 2012

my mac book pro is not recognizing my WD 500 GB external hardrive. I checked and double checked to make sure the external was mac compatible before I bought : and it was. It also is not recongizing an WD external hardrive I borrowed from a co-worker.  Here is what I have done and checked so far. 

- I checked to see if the externals worked on other Mac Pros( just to double check mac compatibility)-  they showed up on on 4 different Mac books.

- I checked to see if  there was something wrong my usb ports. So I incerted my 4 GB flash drive in the USB port, and then my co-workers 4GB  Flashdrive-  My computer recognized both the devices.

-  My computer was very full ( that is why I bought a bigger hardrive to back up my files) so  I thought  maybe there just wasnted even enough free space for my computer to recongize the devices. So I freed up 70GB of hardrive space on my mac book. - still nothing.

- I also checked to make sure  I had the suggested software updates to run the drive, before I bought it.  

Info:
MacBook Pro (15-inch 2.53 GHz)

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Info:
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Info:
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:for those that dont know....

[URL]

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Info:
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Apr 26, 2012

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Screen shot of Disk Utility: [URL] ......

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May 30, 2009

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Will my Mac be able to use this external?

[URL]

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