NS_E_PDA_DEVICE_FULL_IN_SESSION (0XC00D1181) Fix

What This Error Means

You're syncing music or videos to your portable device (like a Zune, old Windows Phone, or media player) using Windows Media Player 12, and suddenly you get error NS_E_PDA_DEVICE_FULL_IN_SESSION (0XC00D1181). The message says the device is full, but you know it's not — there's plenty of space left.

The culprit here is almost always a corrupted sync session. WMP thinks it's still in the middle of a transfer, and it's locked the device's storage as "full" even though it's not. Happens a lot after a cable disconnect mid-sync, or a crash during file transfer.

I've seen this on Windows 7, 8, and 10. Windows 11 too, but less often. Don't bother reformatting your device — that's overkill. Try these steps in order. Stop when the error goes away.

Step 1: The 30-Second Fix – Disconnect and Reconnect

This clears the stuck session more often than you'd think.

1. Safely eject your device from the system tray icon (right-click, Eject).
2. Unplug the USB cable.
3. Wait 10 seconds.
4. Plug it back in.

If WMP picks it up and syncs normally, you're done. If not, move to Step 2.

Step 2: The 5-Minute Fix – Delete the Sync Partnership

WMP stores a sync partnership for each device. That's the file that remembers what you synced last. Corrupt it, and you get this error. Deleting it forces a fresh start.

1. Close Windows Media Player completely.
2. Open Windows Explorer (File Explorer).
3. Navigate to %userprofile%\AppData\Local\Microsoft\Media Player\
4. Look for a folder named Media Player or a file called Sync — actually, just delete everything in that folder. Yes, everything. WMP rebuilds it on next launch.

Note: This resets your playlists and sync history, but not your actual media files. You'll just have to re-sync manually.

Now restart WMP, plug the device in, and try syncing again. Should work. If not, go to Step 3.

Step 3: The 15+ Minute Fix – Clear the Device's Internal Sync Cache

Some devices — especially old Zunes, Creative Zen, or SanDisk Sansa — keep their own sync database. If WMP's session is stuck there, you need to nuke that too.

For Windows Phone / Zune devices (if WMP is used):

1. On the device, go to Settings > Storage (or similar).
2. Look for an option like Clear Sync Data or Reset Sync History. It's often hidden under Advanced Settings.
3. If you can't find it, just delete all synced media from the device using File Explorer (drag and drop to trash). Then re-copy a few files manually to test.

For other devices (Creative, SanDisk, etc.):

1. Connect the device to your PC.
2. Open File Explorer and browse to the device's drive.
3. Look for a folder called SYNC or .wmpdb or MediaDB. Delete that folder.
4. If there's a file named sync.db or wmpinfo.dat, delete that too.

Disconnect the device, restart WMP, reconnect. WMP will treat it as a blank device. Sync should work now.

Last Resort – Windows Media Player Cache Reset

If none of the above worked, the issue might be at the OS level. Run this command as admin:

reg delete "HKCU\Software\Microsoft\MediaPlayer\Services" /f

Then restart WMP. This clears its library cache (not your actual media). You'll need to re-add your folders, but it often kills stubborn session locks.

I've fixed this maybe 50 times in the last decade. Step 2 catches 80% of cases. Step 3 catches another 15%. Rarely need the registry hack, but it's there if you're stuck.

One more thing — check your device's free space. If it's actually below 5% free, WMP sometimes throws this error even if there's technically room. Delete a couple of files manually and try again.