External Hard Drive and iMac issues

When I plug in my external hard drive to my macbook pro, it works great. But when I plug it into my new iMac, it shows up as read only? What can I do to rectify the situation without reformatting the hard drive?

Hi jsncrwfrd182,
If you are having an issue with being unable to access an external hard drive because of permissions, I would suggest that you troubleshoot using the steps in this article - 
OS X Mountain Lion: If you don’t have permission to use a disk
Thanks for using Apple Support Communities.
Best,
Brett L 

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