Windows 11 users often face unexpected storage depletion due to system files and update mechanisms. Microsoft's July update KB5101650 introduced Point-in-Time Restore, which reserves up to 2% of the system disk for snapshots. Additionally, update packages for versions 24H2 and 25H2 occupy 4.8 GB and 5.38 GB respectively.
The WinSxS folder acts as a component store containing original system files, while other directories like System32 use hard links to access them. Deleting contents from WinSxS manually can cause system instability. Users can check actual storage usage via terminal commands, as Windows Explorer often miscalculates space due to hard links.
Reserved Storage, which takes about 7 GB, is designed to ensure updates install even on nearly full disks. Meanwhile, the hiberfil.sys file, used for hibernation and fast startup, consumes space proportional to RAM size—roughly 40% for a full file or 20% for a reduced version. Disabling hibernation can reclaim this space.
The Volume Shadow Copy Service (VSS) can consume up to 10% of a volume by default, though limits are sometimes set to 'unbounded'. Users can manually restrict this limit to prevent excessive disk usage. Furthermore, shader caches for games, particularly those from NVIDIA drivers and Steam, can accumulate significant data, sometimes reaching 60–70 GB in specific cases.
