Depending on the external drive, you may have to have Disk Utility erase the hard drive before it will be able to reformat it. On one of my drives, which had some management software that came on it, I had to select the description of the disk in the disk utility table instead of just the title of the disk to get it to erase.
Hth. -- Cheryl May the words of my mouth and the meditation of my heart be acceptable to You, Lord, my rock and my Redeemer. (Psalm 19:14, HCSB)
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