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I'm trying to delete a primary partition that is marked as both active and system. Which of these attributes is preventing me from deleting the partition?

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Active. You need to unmount (deactivate) the partition before you can delete it. I'm assuming this is on a drive other than the drive of your operating system! :)

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Hmm.. Even System could be it. If your Windows is installed on C:\ & you try to format or delete C:\ via Windows.. it will not allow you to do so. –  Ganesh R. Dec 27 '09 at 7:45
    
How can I unmount the partition? I tried using Computer Management console but there isn't an option there. –  Amr Dec 30 '11 at 17:59
    
@Amr - Try using "Deactivate" –  muncherelli Jan 10 '12 at 3:04
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