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My C: drive is completely filled up, and now I want to allocate some more storage space to it.

Disk Management showing my Disk Memory allocations:
Disk Management showing my Disk Memory allocations

[NOTE] I'll be shrinking (D:) to get unallocated space, which will be given out to the right side of (D:) Drive.

There is this "Recovery Partition" between (C:) and (D:) Drive due to which I'm unable to add unallocated space to (C:) drive ("Extend Volume" option being grayed-out) and I'm not sure whether it is safe to remove that Recovery Partition.

Moreover, even if I do remove that "Recovery Partition", I do not want to copy files from (D:) drive to another new drive for formatting the (D:) drive and deleting that drive because I don't know whether moving these files will break my computer or not.

Files in (D:) Drive:
Files in (D:) Drive

Please guide me to add space to my (C:) Drive in this scenario.

(What I tried): I tried using AOMEI Partition Assistant for merging partition but found out that option being grayed-out as well.

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    AOMEI Partition Assistant or similar solutions can move the partition so existing partitions can be extended. You will want to disable (not suspend) BitLocker protection
    – Ramhound
    Commented Jul 12, 2023 at 18:53
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    Hi and welcome to Superuser 👋🏻. Which Unallocated space are you trying to add? In the Disk Management screenshot, all space seems to be allocated.
    – Yisroel Tech
    Commented Jul 12, 2023 at 18:59
  • It is unadvisable to delete your recovery partition. If you have free space in your D:\ drive, you should shrink it, move it to the right and then move the recovery partition to the right. Then you would have space to expand C:\. I also echo the need to disable bitlocker to accomplish such task. While you are free to use whatever partition assistant you want, I personally recommend Ubuntu Live gparted to resize and move partitions.
    – Brian
    Commented Jul 12, 2023 at 19:06
  • I get the feeling this Q is asked every week, superuser.com/search?q=Extend+%28C%3A%29+Drive+
    – Joep van Steen
    Commented Jul 12, 2023 at 19:28
  • @JoepvanSteen I think that his question is a bit more nuanced, since it's not only about extending to non-contiguous unallocated space, but also about the Recovery partition and D: partition
    – Yisroel Tech
    Commented Jul 12, 2023 at 19:32

1 Answer 1

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Given that you seemingly have system files on the D: partition, and you don't know exactly what and where they were set to be there, I would advise you to leave the D: partition up and running and not mess with what's on it (let's say a program runs from the D: partition, how will it now know to run from the C: partition?)

Instead, you should:

  1. Shrink the D: partition (let's say by 100 GB from the 167 of free space on it) using the Shrink Volume in Disk Management (or with AOMEI Partition Assistant)
  2. Extend the C: partition to all the newly created Unallocated space using the Merge Partitions option in AOMEI Partition Assistant (since Disk Management would not allow you to extend to non-contiguous unallocated space) by select Merge Partitions from the right-click menu of the C: partition and select the Unallocated 'partition' in the popup window. (You can also do the same with most 3rd party partition manager tools, I personally like MiniTool Partition Wizard)
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  • Here's what it is showing when I used AOMEI Partition Assistant after unallocating space from (D:) Drive:- Right-clicking on (C:) Drive and advanced options, Merge Partition being disabled
    – OTUin
    Commented Jul 13, 2023 at 4:03
  • Can you edit your question and share a screenshot of that?
    – Yisroel Tech
    Commented Jul 13, 2023 at 9:31
  • @OTUin - You have to shrink a partition in order to create a adjacent unallocated partition in order to merge the two partitions
    – Ramhound
    Commented Jul 13, 2023 at 16:56
  • @Ramhound - I did shrink a partition and create an unallocated space but I cannot use Merge Partition options as you can see in the third image link I have extended
    – OTUin
    Commented Jul 14, 2023 at 14:18
  • @OTUin - You created an unallocated partition but it’s not adjacent to the partition you want to merge with it.
    – Ramhound
    Commented Jul 14, 2023 at 14:38

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