I bought a Kingston USB drive, and after unsuccessful install by Windows (7) I went to Kingston's support webpage and followed the instructions of how to make it work. I assumed the problem was the drive's letter (the letter 'E' was taken by a different USB drive) so I tried to change it to 'F.' I don't even know if it makes sense, but I ended up with another drive.

I tried to delete it from the disk management, but no success. Is my only option now is to format Windows? Is there another solution?

  • What happened when you right clicked on the partition (in the graphic representation of disk management) and picked "delete"? – jdh May 15 '14 at 0:35
  • @jdh: I got a prompt box that says "Windows cannot delete the active system partition on this disk." – Air Wizardo May 15 '14 at 0:37

You can't delete an active partition, so you'll need to mark a different partition as Active. You should be able to mark the C: as Active, then delete the offending partition. If you aren't able to from within Windows, then you may need to use a Live CD/USB.

Right click on the partition you want to mark as Active and select `Mark Partition as Active'.

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Microsoft Resource on Marking a Partition as Active

  • Holy cow... Just did what you said and got "bootmgr is missing." Luckily, I had a repair disc. After Windows got restored I was able to delete it. Thank you! – Air Wizardo May 15 '14 at 1:34
  • That wasn't what I expected to happen. It was probably due to your F: also being marked as the System drive. – Michael Frank May 15 '14 at 1:45

You can also use DiskPart to remove the active flag on your partition and then delete your unwanted partition. For usage, see the technet documentation for DiskPart.

Your usage will probably be along the lines of select volume X, active,delete volume Y where X is a volume/partition you want to keep and Y is the offending partition you want to delete.

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