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I am trying to merge unallocated space to drive c but unfortunately not able to do so. The drive c option is not showing extend option.

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  • Provide a screenshot of the disk manager which displays your partition information
    – Ramhound
    Oct 17, 2013 at 19:18
  • There was a similar issue here: superuser.com/questions/657167/…
    – MonkeyZeus
    Oct 17, 2013 at 19:20
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    The drive c option is not showing extend option. That’s because Windows will not let you mess around with the system drive. You will need a third-party partition-management program to do that.
    – Synetech
    Oct 17, 2013 at 19:46
  • @Synetech: At least since Windows Vista, the Disk Manager utility can and will extend or shrink the system/boot partition. No doubt the option is not appearing for the Question Asker because there is not in fact contiguous unallocated space at the end of the C drive.
    – kreemoweet
    Oct 18, 2013 at 1:19
  • Hmm, I could have sworn it doesn’t, but I don’t have a drive on hand with free space to check. It could also be a dynamic drive which I believe Windows can’t/won’t extend.
    – Synetech
    Oct 18, 2013 at 1:23

1 Answer 1

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You can't modify the system partition because (as @Synetech commented) Windows locks the C: partition while you're booted into it.

In order to work with the partition you would need to either:

  1. Boot into another OS if you have one installed on a different partition, or
  2. Use a third party bootable tool. I used EaseUS Partition Master Free Edition, and it worked quite nicely.

A word of caution, if you do a lot of moving around, it's possible you may corrupt or otherwise break the MBR. Fixing this requires booting into a command prompt and executing bootrec /fixmbr or bootrec /rebuildbcd. A simple extension of the C: partition should not cause this, though.

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