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The 500GB System File That Eats Your Hard Drive
My Windows 10 computer has a mysterious file that is taking up nearly 500 gigabytes of space on my hard drive, and I cannot figure out what it is, where it came from, or whether it is safe to delete,...
Definitely do not delete it blind. First identify exactly what file or folder is using the space with a disk-usage tool run as administrator, or by checking Storage settings and hidden/system files carefully.
Common large “system” suspects are hiberfil.sys, pagefile.sys, memory dump files, Windows.old, restore points, or shadow copies under System Volume Information. If it is restore points, check System Protection storage limits. If it is Windows.old or update cleanup, use Disk Cleanup or Settings > Storage rather than manually deleting files. If the name/location looks random, run Microsoft Defender Offline before touching it.