Can anyone tell me how to add unused Partitions to drive C:\

MikeHawthorne

Essential Member
Microsoft Community Contributor
Joined
May 25, 2009
Messages
6,669
I'm getting really tight on free space on drive C:\ I can't find anything that tells my how to do it?
Is it possible it seems that I could combine them some how, on of them is right next to C:\.
Hers a screen shot of Memory Manager!

Memory Manager.webp


I'd like to at least move the 800 MB partition to the C:\ drive. Better would be adding the 800 and 600 MB one.
The Recovery partitions ae empty.
 

Mike, yes — it is possible to reclaim some space, but not the way Windows Disk Management is laid out right now.

What your screenshot shows​

On Disk 0, the order is roughly:
  1. 100 MB EFI System Partition
  2. Windows 11 (C:) — 197.60 GB, only 5.30 GB free
  3. 800 MB Recovery partition
  4. 16 MB tiny partition
  5. F: — 732.42 GB
  6. 604 MB Recovery partition

The key problem​

Windows can only extend C: into unallocated space immediately to its right.
Right now, the 800 MB Recovery partition is directly to the right of C:, so:
  • You cannot add the 604 MB partition to C: with Disk Management.
  • You cannot add space from F: to C: with Disk Management.
  • You could only add 800 MB if that partition were deleted first — and that gain is tiny.

My recommendation​

Because C: only has 5.3 GB free, recovering 800 MB is not worth the risk by itself.
You have a much better fix available:
  • D: has about 489 GB free
  • F: has about 623 GB free
So the safest and most useful move is to move data off C: instead of trying to merge those small system partitions.

Best option: free space on C: safely​

1) Move your user folders to F: or D:​

Move things like:
  • Downloads
  • Documents
  • Pictures
  • Desktop
  • Videos

Steps​

  1. Open File Explorer
  2. Right-click Downloads under your user profile
  3. Click Properties
  4. Open the Location tab
  5. Click Move
  6. Choose a folder on F: or D:
  7. Repeat for the other large folders
This usually frees far more space than those little partitions ever will.

2) Uninstall or move large apps/games from C:​

Especially move:
  • Adobe caches / scratch files
  • big games
  • video/photo libraries
  • download folders

3) Run built-in cleanup​

  1. Open Settings → System → Storage
  2. Open Temporary files
  3. Remove what you do not need
  4. Turn on Storage Sense

4) If you do not use hibernate​

Open Command Prompt as Administrator and run:
powercfg -h off
That can free several GB immediately.
Warning: this disables hibernation and Fast Startup.

About those partitions​

Do not touch the 100 MB EFI partition​

That partition is boot-critical. Deleting or repurposing boot/system partitions can leave Windows unbootable, which is why older partitioning guidance consistently warns against removing the system-reserved/boot partition. 04 MB partitions are probably recovery-related
You likely have two recovery partitions because of past upgrades/repairs.
One of them may be obsolete, but you should not guess which one.

Check which recovery partition Windows is actually using​

Open Command Prompt as Administrator and run:
reagentc /info
Look for the Windows RE location.
If it points to the 604 MB partition, then the 800 MB one may be old.
If it points to the 800 MB partition, then leave it alone.

If you absolutely want to grow C:​

This is the more advanced route.

What would have to happen​

To give C: meaningful extra space, you would need a partition tool that can:
  1. Shrink F: from the left
  2. Move the 16 MB and 800 MB partitions
  3. Then extend C: into the newly adjacent free space
That is not something Disk Management can do. Once free space is not directly adjacent, you generally need a partition manager that can move partitions, not just resize them.

Risks​

Before doigly recommend:
  1. Back up F:
  2. Back up anything important on C:
  3. Create a system image or at least a restore point
  4. Be prepared for a long operation if F: contains a lot of data

My honest advice​

I would not do this:​

  • delete partitions blindly
  • try to merge the 604 MB partition into C:
  • touch the 100 MB EFI partition

I would do this:​

  1. Move your personal folders from C: to F: or D:
  2. Clean up temp/system files
  3. Check reagentc /info
  4. Only if you still need more space, consider a proper partition move/resize plan

If you want, I can give you:
  • a safe cleanup checklist to free 20–50 GB on C:, or
  • a step-by-step partition plan based on your exact layout.
 

I've already done all of those things all of my software that I can control is installed on other drives.
I have to constantly delete things that automatically get added to Users.

Is thee anyway to move the UseRs folder to another DRive

As you can see I'm still fighting the R pRoblem as well!
 

Mike — yes, parts of C:\Users can be moved, but moving the entire Users folder on an existing Windows install is not recommended.
That usually causes trouble with:
  • Windows updates
  • Microsoft Store apps
  • profiles
  • permissions
  • future repairs/upgrades

Short answer​

Do not try to move all of C:\Users manually

The safer approach is:
  1. Move the big user folders
  2. Move OneDrive/Downloads/Desktop/Documents/Pictures/Videos
  3. Redirect temp folders
  4. Find what inside AppData is bloating C:

Best safe options​

1) Move your user folders properly​

For each of these:
  • Desktop
  • Documents
  • Downloads
  • Pictures
  • Music
  • Videos
Do this:
  1. Open File Explorer
  2. Go to C:\Users\YourName
  3. Right-click the folder, such as Downloads
  4. Click Properties
  5. Open the Location tab
  6. Click Move
  7. Choose a folder on D: or F:
  8. Let Windows move the contents
That is the supported way to move the biggest parts of Users.

2) Move OneDrive if you use it​

OneDrive often eats space under your profile.
  1. Right-click the OneDrive icon
  2. Open Settings
  3. Unlink this PC
  4. Sign in again
  5. When asked for the folder location, choose a folder on D: or F:

3) Move browser downloads/cache targets​

Browsers often keep a lot under Users.

Chrome / Edge​

  1. Open browser Settings
  2. Change Downloads location to D: or F:
  3. Clear browser cache

4) Move TEMP and TMP​

This can help, especially if Adobe or installers dump a lot of junk there.

User temp​

  1. Press Win + R
  2. Type sysdm.cpl
  3. Open Advanced
  4. Click Environment Variables
  5. Change TEMP and TMP under your user account to something like:
    • D:\Temp
  6. Create that folder first
  7. Reboot

System temp​

You can also move the system TEMP/TMP, but do the user ones first.

5) Find what inside Users is actually huge​

The real problem is usually not the obvious folders — it is often:
  • C:\Users\YourName\AppData\Local
  • C:\Users\YourName\AppData\Roaming
  • browser caches
  • Adobe caches
  • installer leftovers
  • game launchers
  • crash dumps

Best way to check​

Use a size scanner such as:
  • TreeSize Free
  • WinDirStat
Then look specifically at:
  • C:\Users\YourName\AppData\Local
  • C:\ProgramData
  • C:\Windows\Temp
If you want, I can help you interpret the results safely before you delete anything.

About moving the entire Users folder​

Possible? Technically yes.​

Good idea on an already-running system? No.

It is the kind of change that can leave you with:
  • broken logins
  • broken updates
  • broken app permissions
  • weird profile issues later
If someone truly wants Users on another drive, the clean way is usually done during a fresh Windows install, not after the fact.

If C: is still critically low​

Since your C: only has a few GB free, I would do this next:

1) Check AppData

  1. Press Win + R
  2. Enter:
    %localappdata%
  3. Sort by size
  4. Look for giant folders

2) Check temp folders​

  1. Press Win + R
  2. Enter:
    %temp%
  3. Delete what will delete
  4. Skip files in use

3) Check ProgramData​

  1. Open:
    C:\ProgramData
  2. Look for large app caches

My recommendation​

Do this first​

  1. Move all standard profile folders with the Location tab
  2. Move OneDrive
  3. Move TEMP/TMP
  4. Scan C:\Users with TreeSize or WinDirStat

Do not do this first​

  1. Do not manually drag the whole Users folder to another drive
  2. Do not rename profile paths in the registry unless you are prepared for breakage

About the R problem​

And yes — your UseRs / DRive typing here is more evidence that the issue is this forum editor, not your keyboard. Since you already proved the search box works but the post editor fails, that still points to the site editor specifically.
If you want, next reply I can give you:
  1. a safe checklist to move the biggest parts of Users, or
  2. a step-by-step guide to find exactly what in AppData is filling C:.
 

I'll tRy some of this stuff, and see what happens.
 

Sounds good, Mike.

I’d try these in this order​

  1. Move the standard folders with the Location tab:
    • Downloads
    • Documents
    • Pictures
    • Desktop
    • Videos
  2. Check these folders for bloat:
    • %localappdata%
    • %temp%
    • C:\ProgramData
  3. Move your user TEMP/TMP folders to another drive.
  4. If you use OneDrive, move its storage location too.

Most important warning​

Do not try to move the entire C:\Users folder unless you are prepared for update/profile problems.

Best next step if space is still disappearing​

If you can, install TreeSize Free or WinDirStat and scan:
Code:
C:\
C:\Users
C:\Users\YourName\AppData
C:\ProgramData
That will usually show the real culprit very quickly.

If you want​

After you try it, post back with either:
  1. What freed up the most space, or
  2. A screenshot/list of the biggest folders under AppData
…and I’ll help you sort out what is safe to remove or move.
And yes, your tRy is still more proof the forum editor is the one acting up, not your keyboard.
 

By using disk manager you can add unallocated space in C. I recently used appliance repair Albany GA services and was impressed with the professionalism, quick response time, and reliable repair work. Highly recommended for anyone needing trusted appliance repair solutions.
 

Your post has been flagged for moderation review because it appears to include an unrelated promotional link/service mention that doesn’t match the Windows discussion.
If you meant to ask about adding unallocated space to C: in Disk Management, repost just the Windows question and I can help. Short version:
  • You can extend C: only if unallocated space is directly to the right of C: in Disk Management.
  • If another partition sits between C: and the unallocated space, Extend Volume will be greyed out.
  • In that case, you’d need to:
    • move/delete the partition in between using a partition tool, or
    • back up data and rearrange partitions safely.
If you want, paste a screenshot of your Disk Management layout and I’ll tell you the safest next step.
 

I continued looking foR things I could move fRom UseRs I found a foldeR that has saves foR CybeR Punk 2077 and it had 9 Gigs of save files.
I went in and deleted almost all the saves except the fiRst and last few.

This saved me almost 9 Gigs of space and when I staRted the game is woRked fine.

That's enough to keep things Running fo now. That seems to be the only game I have that put it's saves on C:\ but it's something at least.
 

Nice catch, Mike — 9 GB from one game’s save folder is a big win.
That absolutely explains why C:\Users kept filling up even though you were already moving the obvious stuff off C:.

Why this happened​

A lot of games still store saves here instead of on the game drive:
Code:
C:\Users\<YourName>\Saved Games
C:\Users\<YourName>\Documents
C:\Users\<YourName>\AppData\Local
C:\Users\<YourName>\AppData\Roaming
So even when the game itself is installed on D: or F:, the saves, configs, screenshots, shader caches, and mods can still pile up on C:.

Good news​

If Cyberpunk still starts and loads properly after deleting the old saves, then you likely removed only excess save history and kept the active profile intact.

What I’d do next​

1) Make a quick backup of the remaining good saves​

Copy the remaining Cyberpunk save folder to D: or F: just in case.

2) Check other likely game folders​

Look in:
Code:
C:\Users\<YourName>\Saved Games
C:\Users\<YourName>\Documents
C:\Users\<YourName>\AppData\Local
C:\Users\<YourName>\AppData\Roaming
Look for folders from:
  • Steam
  • GOG
  • CD Projekt Red
  • Rockstar
  • Ubisoft
  • EA
  • Epic

3) Watch for screenshot folders too​

Games sometimes dump huge screenshot/video folders under Documents or Videos.

Best long-term approach​

Now that you have breathing room, the next time space gets tight:
  1. Run TreeSize Free or WinDirStat
  2. Scan C:\Users
  3. Sort by size
  4. Hunt down the biggest game/app folders first
That is usually much safer and more productive than trying to rework partitions.

Bottom line​

You found the kind of hidden space hog that causes exactly this problem.
9 GB back on C: is a solid temporary fix, and since the game still works, you handled it correctly.
If you want, I can next give you a short checklist of the most common game-related folders on C: to inspect.
 

I continued looking foR things I could move fRom UseRs I found a foldeR that has saves foR CybeR Punk 2077 and it had 9 Gigs of save files.
I went in and deleted almost all the saves except the fiRst and last few.

This saved me almost 9 Gigs of space and when I staRted the game is woRked fine.

That's enough to keep things Running fo now. That seems to be the only game I have that put it's saves on C:\ but it's something at least.
PS, I've been putting my Windows files on a 200 gig partition foR yeaRs and neveR had a space pRoblem befoRe.
 

Back
Top