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Fix a file that will not copy

We'll check disk space, permissions, path length, and help you copy the file successfully.

Troubleshooting · Home maintenance
5–15 min
What you'll need
  • Read access to the source file
  • Write access to the destination folder
Step 1 of 7

Quick triage — pick your path

Quick triage — pick your path

Choose the option that matches what you see. You can jump straight to that section.

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Steps

Goal: Check disk space, permissions, path length, and copy the file successfully.

  • Check that the destination drive has enough free space.
  • Confirm read permission on the source file and write permission on the destination folder.
  • If the path exceeds 260 characters (Windows), copy to a shorter path first.
  • Close any program that has the file open.
  • Try copying to a different drive or folder to isolate the issue.
  • Good: The file copies successfully. Bad: Copy still fails—check drive errors or contact IT for network shares.

Check space

Goal: Check the destination has enough free space.

  • Right-click the destination drive > Properties. Check free space.
  • The file size must fit. Free space by deleting or moving files, or copy to a different drive.
  • You should see enough free space (at least the file size).

Check permissions

Goal: Check read permission on source and write permission on destination.

  • Source: Right-click the file > Properties > Security. Confirm Read access.
  • Destination: Right-click the folder > Properties > Security. Confirm Modify or Write access.
  • Add your account or run as Administrator if needed. You should see the copy succeed.

Shorten path

Goal: Work around the 260-character path limit on Windows.

  • Copy to a shorter path first (e.g. C:\temp).
  • Then move the file to the final destination.
  • Or use robocopy: robocopy “source” “dest” “filename” /copy.
  • You should see the copy succeed.

Verification

  • The file appears in the destination folder.
  • The file size matches the source.
  • You can open the copied file and confirm the content is correct.

When to get help

  • File is on a network share and you lack permission—contact the share owner or IT.
  • Destination is a work server—check with IT for quota or permission limits.
  • Copies often fail to a specific drive—the drive may be failing; run chkdsk or Disk Utility.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Check disk space Confirm the destination has enough free space.
  2. Check permissions Verify read on source and write on destination.
  3. Shorten path Copy to a shorter path first if over 260 characters.
  4. Close programs Close any app that has the file open.
  5. Try different destination Copy to another drive or folder to isolate the issue.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Source and destination paths
  • Error message when copying
  • Free space on destination drive

Does the destination drive have enough free space?

Insufficient space is a common cause of copy failure.

Right-click the destination drive > Properties. Check free space. The file must fit. Good: Plenty of space—check permissions. Bad: Drive full—free space or copy elsewhere.

Yes No

You can change your answer later.

Free space or copy elsewhere

Delete or move files to free space, or copy to a different drive with enough space.

Done

Do you see "access denied" or "permission denied"?

Check read on source and write on destination.

Right-click source file > Properties > Security. Confirm Read access. Right-click destination folder > Properties > Security. Confirm Modify or Write access. Good: Permissions OK—check path length. Bad: Add your account or run as Administrator.

No (denied) Yes

You can change your answer later.

Fix permission and retry

Add your account to the source (Read) and destination (Modify/Write). Or run Explorer/Command Prompt as Administrator. Try copying again.

Done

Does the error mention "path too long" or 260 characters?

Windows has a 260-character path limit.

Copy to a shorter path first (e.g. C:\\temp), then move to the final location. Or use robocopy. Good: Copy succeeds. Bad: Different error—close programs or try different destination.

Yes No

You can change your answer later.

Copy to short path first

Copy to C:\\temp or similar. Then move to the final destination. Use robocopy if needed.

Done

Try different destination

Copy to Desktop, USB drive, or another folder. If it works, the original destination has an issue (permission, path, or drive).

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would a file not copy?
Common causes: not enough disk space, permission denied, path too long (Windows), file in use, or destination drive errors. Check space and permissions first.
How do I fix "path too long" when copying?
Windows limits paths to 260 characters. Copy to a shorter path first (e.g. C:\\temp), then move to the final location. Or use robocopy which handles long paths with /mir or /copy.
What if I get "access denied" when copying?
Check read permission on the source file and write permission on the destination folder. Run Explorer or Terminal as Administrator if needed. For network drives, check share permissions.

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