That guy with the mullet looks sharp
Apparently it’s because CrowdStrike installed their device driver as one that must start when Windows starts.
Explained here: https://youtu.be/wAzEJxOo1ts?feature=shared&t=675
I’ve linked to the specific time where he explains that issue, but tbh the whole video is worth watching.
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An annual degradation of 1.8% over 20 years gives more than 69% capacity the end of the period, so it’s better than what you posted.
Each year, you have 0.982 of the previous year’s capacity (1 - 0.018), so the capacity at the end of the 20 years is 0.982 ^ 20.