External Harddrive won't work on iMac

I have an external harddrive that I previously used on my PC. It only has generic JPG files saved to it. When I plug it in to my iMac it is read only and will not allow me to save things to the disk. In the information menu it shows that it is read only and I cannot modify the files or create new folders.
What do I have to do to make this work? Is there any initialize process or something?

The safest thing to do would be to get a new external drive. Look up the reviews via Google on the external drive before buying. Best to get a drive that is Mac friendly.
You could try this driver:
NTFS-3G for Mac OS X is a read-write (finally) NTFS file-system driver. This means we can finally write to memory sticks larger than 4GB (formatted with NTFS).
http://mac.sofotex.com/download-131789.html
A bad driver would trash your external disk. Backup important data.
Robert
Message was edited by: rccharles

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