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Win11 WpnUserService writing disk continuously
When a notification pops up in the lower-right corner, the WpnUserService service begins writing to the disk. The more notifications pop up, the faster the write speed. For a long time, I didn't notice this, resulting in a maximum speed of 50-100MB/s. My disk wrote about 20TB in just three months. Once the notification is cleared, the write speed slows down until it's almost not to write. Windows Version: Windows 11 Pro 24H2 26100.4770
4 Replies
It sounds like the WpnUserService (Windows Push Notifications User Service) is causing high disk activity whenever notifications appear, leading to heavy disk writes. This behavior isn't typical and can be quite disruptive.
WpnUserService is responsible for managing push notifications and live tiles. When notifications appear, especially if they trigger background processes or updates, the service can generate significant disk activity.
Manually stop the WpnUserService and restrict WPD device writing via group policy.
If the problem persists despite these steps, it may be worth considering a system reset or reinstalling Windows, especially if large amounts of data are being written unexpectedly.
