SpaceSentinel

Can I Delete hiberfil.sys? One Command Frees Gigabytes

Yes — but not with the Delete key. Run powercfg /h off as administrator and Windows disables hibernation and removes the file. On a 16GB-RAM machine that's typically 6GB+ back instantly.

  1. Know the trade-off first: the Hibernate option disappears and Windows Fast Startup is disabled (cold boot a few seconds slower); Sleep is unaffected
  2. Open an elevated terminal and run: powercfg /h off
  3. Done — hiberfil.sys vanishes immediately, no reboot needed; bring it back anytime with powercfg /h on
  4. Middle ground: powercfg /h /type reduced keeps Fast Startup while roughly halving the file
  5. Note: deleting hiberfil.sys in File Explorer doesn't work — it's a protected system file; the powercfg command is the only way
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FAQ

Hibernate vs Sleep — what is the difference?

Sleep keeps your session in RAM (tiny power draw, instant wake). Hibernate writes it to hiberfil.sys and powers off completely (no power draw, slower wake). Desktops and always-plugged laptops rarely need hibernate.

Does disabling hibernation hurt performance?

Zero impact on day-to-day performance. The only change is losing Fast Startup — cold boots take a few extra seconds. Sleep works exactly as before.