Quick answer: Hibernate uses disk space through hiberfil.sys. Sleep mainly keeps state in memory and does not need the same large hibernation file.
Why this happens
Users often see hiberfil.sys and wonder if it is safe. The answer depends on whether they use Hibernate or Fast Startup.
Safe steps
- Decide whether you use Hibernate.
- Understand that Fast Startup may also use hibernation features.
- Use powercfg commands only if you are comfortable with admin tools.
- Restart after changing hibernation settings.
- Re-enable Hibernate if you need it later.
What to avoid
Do not delete hiberfil.sys manually. Disable Hibernate through Windows power settings or powercfg.
Use DiskTidy for review-first cleanup
Download DiskTidy to scan common cleanup locations and large files locally before deciding what to remove.