Disable Hiberfil Sys - __full__

dir C:\hiberfil.sys /a You should see: File Not Found

powercfg -h -size 60 This limits the file to 60% of RAM – enough for Fast Startup but not for full hibernation. | RAM Size | Default hiberfil.sys size | Space recovered after disable | |----------|---------------------------|-------------------------------| | 8 GB | ~3.2 – 6 GB | ~3–6 GB | | 16 GB | ~6.4 – 12 GB | ~6–12 GB | | 32 GB | ~12.8 – 24 GB | ~13–24 GB |

powercfg /availablesleepstates Or check hibernation status: disable hiberfil sys

Alternatively, verify in File Explorer (with hidden & protected OS files visible) – the file should be absent. To restore hiberfil.sys and hibernation functionality:

powercfg /a Execute:

powercfg -h on This recreates the file with the default size (approx. 40–75% of RAM). To set a (e.g., for Fast Startup only):

powercfg -h -size 50 (Value is percentage of total RAM, from 40 to 100.) If you need Fast Startup but want to reduce space, you can set a smaller hibernation file: dir C:\hiberfil

1. Overview hiberfil.sys is a system file created by Windows to support the Hibernation feature. When a computer hibernates, the entire contents of RAM (including open documents, running applications, and system state) are written to this file. Upon waking, the system reads the file back into memory, restoring the exact pre-hibernation state.