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panaca Level 1 Level 1 (0 points)

I bought a new MacBook Pro to replace an older MacBook Pro.   I also bought a new Toshiba 1T portable hardrive to backup my new computer.   The Toshiba hard drive will not mount on the new computer, but it will mount on my old computer.  

 

However, I have two other portable hard drives (320 MB and 500 MB) that do mount on the new computer.   I am puzzled as to why the new MBP will not display my Toshiba 1T portable HD.

 

Any ideas?

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