• The issue is reportedly caused after installation of KB5063878 or KB5062660.
  • KB5063878 is the final security update for Windows 11, version 24H2 that Microsoft released on this month’s Patch Day.
  • KB5062660 is the preview update of the update, which Microsoft released at the end of July 2025
  • The issue may affect systems with solid state drives (SSD) if a) a large number of files or b) a large single file are written to the drives.
  • The drive becomes inaccessible in worst case.