I want to reformat my external hard disk but disk utility said it could not be unmounted

Posted by Faith on Super User See other posts from Super User or by Faith
Published on 2013-03-11T06:18:10Z Indexed on 2014/05/30 15:37 UTC
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disk-utility

Hi I wanted to reformat my HP 500GB hard disk to MS DOS (FAT) by using Disk Utility but Disk Utility kept saying that the hard disk cannot be unmounted. I tried googling it but nothing seems to answer my question. I'm not trying to reformat the hard disk in my Mac but my external hard disk!

I usually format my hard disks to clear the documents I no longer need. And I'll change it to ExFat but currently, whenever I plug in my hard disk on Windows, the whole system just hangs there.

Can someone help??

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