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I'm using Windows 8.1. It is installed on the C: drive.

The problem is that the drive is full. I have 200 GB of unallocated space, but I don't know how to merge it with the C: drive.

I tried to extend the drive from My Computer→Manage but that option is not available there:

Screenshot of contextual menu

These are my drives:

Screenshot of PC drives

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    1. I would check why C is full and whether there are not a lot of files that can be deleted. 2. To extend the C drive you have to go into disk management. If you want more detailed guidance you will have to post a picture of your current disk management situation.
    – whs
    Commented Dec 26, 2015 at 18:39
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    Could we see a screenshot of Disk Management? Run diskmgmt.msc to get there directly.
    – Ben N
    Commented Dec 26, 2015 at 18:47
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    The space has to be nothing. It can't be an empty partition nor can it be a full. What colour is the 200 GB space? It has to be grey and say unallocated
    – Racing121
    Commented Dec 26, 2015 at 23:21
  • @whs question edited please check!
    – Iftikhar uddin
    Commented Dec 27, 2015 at 5:04
  • @RACING121 check the question now please.
    – Iftikhar uddin
    Commented Dec 27, 2015 at 5:04

3 Answers 3

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I would recommend using Partition Wizard for this instead of the Windows Disk Management tool. It has a much friendlier UI and many more other useful features. Once you have it installed, launch it with administrator privileges (right click on the icon/shortcut and choose 'Launch as Administrator'). Then right click on the E: partition and select 'move/resize'. In the pop-up window move your cursor over the right edge of the partition and drag it until it fills up the unallocated space. Now drag the left edge to the right so that there is now free space before the E: partition. Click the 'apply' button to save the changes. Your PC may need to reboot to do so. If it does just be patient as it may take a couple of minutes to move files around the drive. Definitely don't turn off your PC when it's doing this because you could definitely loose data if you do.

Also, I would recommend keeping an partition on you drive just for your personal data though (docs, pics, vids, etc.) so that if you ever get a virus or have isssues with Windows and need to reinstall you can just format the C: partition, reinstall Windows, and all of your personal data would remain untouched on the other partition. I use a similar setup and it's served me well for years.

I hope this helps!

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  • And don't even think of starting without a backup.
    – Tetsujin
    Commented Dec 27, 2015 at 18:23
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Alternative: mounting a different partition as a folder on another. This is easier and slightly safer than rearranging your partitions, but the resulting configuration is not quite as versatile.

Create a new, normal partition in the unallocated space. On your C drive, choose or create an empty folder whose disk space will be provided by this new partition. (Your Documents folder might be good a candidate if you can temporarily move all the stuff out.) Right-click the new partition and choose Change drive letter and paths.

letters and paths

Click Add.

add path

Click Browse, then navigate to the empty folder you just made or cleared out.

select the path

Click OK on all the dialogs. Changes take effect immediately.

The disadvantage of this solution is that only files in the directory you choose will be stored on the new partition; other locations on the C drive will still be subject to the size restriction.

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You can't extend the C: drive because there is no unallocated space next to it. It doesn't matter what operating system you are using. Increasing and decreasing partitions can only be done with space that is directly next to them.

As you can see from the picture below, you want to increase Partition 1 (the C: drive) using the free space of Partition 3 (unallocated). I think you can understand now why that isn't possible. Partitions can only be allocated in one contiguous range.

Advanced tools, like Partition Wizard as recommended by SeanPercy42, should be able to move the unallocated space so it is next to the C: drive. But this will take a lot of time.

enter image description here

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  • I would imagine this operation taking a while on a HDD, but it has actually always been remarkably fast for me on a SSD. The developers of PW are actual wizards.
    – user769452
    Commented Jul 23, 2018 at 13:36

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