Fix STATUS_DISK_QUOTA_EXCEEDED (0xC0000802) – Clean Up Now

Cause #1: Your user account hit its disk quota limit

This is the most common reason you'll see the 0xC0000802 error. Windows enforces per-user storage limits on NTFS drives. When you try to save a file, copy data, or install a program, and your quota is full, Windows throws this error. You'll see it most often on work computers with IT-managed quotas, or on shared network drives.

The fix is straightforward: free up space under your quota. Don't bother with system-wide cleanups that affect other users — you only need to clear your own files.

Step-by-step: Clean up your files

1. Open File Explorer (Windows key + E).
2. Navigate to your user folder — usually C:\Users\YourUsername.
3. Sort by size to find big space hogs. In the Search box, type size:>100MB and hit Enter. This shows all files over 100 MB.
4. Delete or move old files — focus on Downloads, Desktop, and Documents. Videos, ISO files, and old installers are the worst offenders. Right-click each big file and pick Delete.
5. Empty the Recycle Bin — right-click the Recycle Bin icon on the desktop, select Empty Recycle Bin. After you do this, the space is actually freed under your quota.
6. Check your current quota usage — right-click the drive (usually C:), select Properties, then the Quota tab. You'll see your limit and current usage. If you're under the limit, the error might be from something else.

After cleaning, try the operation again. If the error still shows up, move on to Cause #2.

Cause #2: The volume quota is full, not your user quota

Sometimes the error pops up even when you have plenty of personal space. The culprit here is the global volume quota — the total limit for everyone on that drive. This happens a lot on shared drives in small offices or school computer labs. The admin sets a limit for the whole volume, and when all users combined fill it, the error hits everyone.

You can't fix this alone. But here's what works if you have admin rights:

Step-by-step: Check and adjust volume quotas

1. Open an elevated Command Prompt — right-click Start, choose Command Prompt (Admin) or Windows Terminal (Admin).
2. Check current settings — type fsutil quota query C: and press Enter. You'll see something like:

   Quota for volume C: is enabled
   Default quota limit: 10.00 GB
   Default quota warning: 8.00 GB
   

3. Disable quotas temporarily — if you're the admin and you need to get everyone working again, run:

   fsutil quota disable C:

   After that, the error should disappear right away. But know that turning off quotas means no limits — anyone can fill the drive completely.
4. Or increase the limit — if the drive has free space, run:

   fsutil quota enforce C: 0xFFFFFFFF

   That removes the limit entirely. But I recommend setting a higher limit instead, like 50 GB per user.

Don't disable quotas permanently. They prevent one person from eating all the space. Set a reasonable limit and warn users before they hit it.

Cause #3: The drive has some corruption or quota meta-data is stale

This one's rare but I've seen it on older Windows 10 builds. The quota system can get confused — it thinks you've used more space than you actually have. This happens after a crash or a failed backup.

Running a disk check often fixes the stale data.

Step-by-step: Run a disk check and reset quota

1. Open an elevated Command Prompt — right-click Start, pick Command Prompt (Admin).
2. Run chkdsk — type chkdsk C: /f and press Enter. You'll see:

   Chkdsk cannot run because the volume is in use by another process. Would you like to schedule this volume to be checked the next time the system restarts? (Y/N)

   Type Y and hit Enter.
3. Restart your computer — Windows will check the drive for errors during boot. Let it finish. This can take 10-30 minutes depending on drive size.
4. After restart, open Command Prompt again — run fsutil quota query C: to see if the used space dropped. If it did, you're done.
5. If chkdsk didn't help — you can try resetting quota entries for your user:

   fsutil quota modify C: 0xFFFFFFFF 0xFFFFFFFF YourUsername

   This removes the per-user limit for your account. Be careful — this might not be allowed on corporate machines.

Quick-reference summary table

That's it. You should be able to save files again after one of these three fixes. If the error still shows up after all this, you might have deeper file system issues. In that case, back up your data immediately and run a full chkdsk with chkdsk C: /r — but that's a last resort.