I mounted my external hard drive to a pc and now I don't have edit or write permissions on my Mac (read only). How do I get them back without erasing the drive?

Hello all, I am a photographer and have my portfolio, edited and raw images backed up on a Seagate Free Agent External Hardrive. I mounted my external hard drive to a pc recently and now I don't have edit or write permissions to it on my Mac (read only). How do I get them back without erasing the drive and loosing my valuable work?

If you re-format it you will lose all the data on it!!!!! So make sure you have backed up the drive or moved all the data on it to another external HD or the internal HD on your iMac.
Below is an Apple Advice letter that explains how to format an external HD, it's written for Aperture but you can use the instructions to formate any external HD.
http://support.apple.com/kb/HT3509

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