Windows 11 KB5121003 may automatically cut power on Lenovo PCs. Users report AC disconnects and black screens. HP Victus may be affected too ... Show more
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cmbatt.sys
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pdc.sys
User finds why Windows 11 KB5121003 may automatically cut power on Lenovo PCs
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Summary created with AI assistance · Source: pcgameshardware.de
Summary created with AI assistance · Source: pcgameshardware.de
- Windows stores pagefile.sys hidden by default in drive C:'s root directory and manages its size automatically.
- The file moves modified application data unused for longer periods, freeing RAM for current tasks.
- Disabling the file lowers Windows’ commit limit to slightly less than the installed amount of RAM.
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Summary created with AI assistance · Source: xda-developers.com
Summary created with AI assistance · Source: xda-developers.com
- According to the article, hiberfil.sys normally reserves 40% to 100% of installed system memory.
- With 64GB of memory, the file can occupy 25GB to 50GB of SSD storage, the article says.
- The article estimates that daily writes could reach 5TB to 10TB or more over two years.
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pcgameshardware.de/Windows-Software-277633/News/Windows-11-Herunterfahren-Neustart-Schnellstart-1554281/
User finds why Windows 11 KB5121003 may automatically cut power on Lenovo PCs
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Key FactsWindows Fast Startup causes avoidable SSD writes
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Summary created with AI assistance · Source: xda-developers.com
Summary created with AI assistance · Source: xda-developers.com
- With Fast Startup enabled, Windows creates a compressed snapshot of the kernel and drivers during shutdown and stores it as hiberfil.sys on the boot drive.
- On the system described, hiberfil.sys occupied 12.5GB, while hiberfil.sys and pagefile.sys together used 24GB of storage.
- Repeated writes can contribute to drive wear over its working life, and an SSD with little free space may be affected more because of higher write amplification.
- Fast Startup can be disabled through Power Options, while powercfg /h off deletes hiberfil.sys and powercfg /h on reverses the change, but laptops then lose automatic hibernation protection if the battery runs out.
The problem is the fact that, over time, these become thousands of writes over the drive's working life, and every single one of them is avoidable.— Abhinav, the article's author; describing the wear caused by hiberfil.sys writes and the impact of Fast Startup.
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