Fix 0X000000DF: File too large to save on Windows

When does this error show up?

You're copying a big video file, a VM disk image, or a huge ZIP archive to a USB drive or SD card. Halfway through, Windows gives you the error: 0X000000DF - ERROR_FILE_TOO_LARGE. The file size exceeds what the drive allows. This is common with USB sticks, older external drives, or cameras that use FAT32.

Why does this happen?

Your drive uses a file system that has a maximum file size limit. FAT32, for example, can't handle files over 4GB. So if you try to save a 5GB movie onto a FAT32 USB stick, you'll see error 0X000000DF. Windows 10 and 11 both report this error the same way. The real fix is to change the file system on the drive to something that supports bigger files, like exFAT or NTFS.

The fix: Reformat the drive to exFAT or NTFS

Here's the step-by-step. You'll lose everything on the drive, so back up your files first. If the drive is empty, you're good to go.

1. Plug the drive into your PC.
2. Open File Explorer and right-click the drive (like D: or E:).
3. Select Format from the menu.
4. In the Format window, find the File system dropdown.
5. Choose exFAT if you need compatibility with Mac and game consoles too. Choose NTFS if it's just for Windows — it's faster and more secure.
6. Set Allocation unit size to Default.
7. Give the drive a name in Volume label.
8. Uncheck Quick Format only if the drive has bad sectors. For a regular fix, leave it checked.
9. Click Start. Windows warns you will erase data. Click OK.
10. Wait a few seconds. Done.

What if I can't format the drive?

If the drive has important data you can't back up, you're stuck. You can try compressing the file with WinRAR or 7-Zip to split it into smaller parts. That's a workaround, not a real fix. Long term, you'll need to move the data off and reformat.

Check if your drive is FAT32 first

Before formatting, you can check the file system. Open This PC in File Explorer. Right-click the drive, choose Properties. Under the General tab, you'll see File system. If it says FAT32, that's your problem.

To see all drives at once, open Command Prompt as admin and type:

fsutil fsinfo drives

Then for each drive letter, type:

fsutil fsinfo volumeinfo D:

Replace D: with your drive letter. Look for File System Name : FAT32.

What if I still get the error?

Two things can still go wrong:

• The file is over 4GB and you chose exFAT — exFAT supports files up to 16 exabytes, so that's not the issue. But if you chose FAT32 again, redo the format and pick exFAT or NTFS.
• The drive is failing — run a check with chkdsk D: /f in Command Prompt. Replace D: with your drive. If it finds bad sectors, the drive might be dying. Back up your data and get a new drive.

I've seen this error a hundred times with people trying to save a 4.5GB ISO file to a FAT32 USB stick. Once you switch to exFAT, it works every time.

If you're still stuck after formatting, try a different USB port or a different computer. Some older USB controllers have a file size bug. But 9 times out of 10, reformatting to exFAT is the fix. Good luck.