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incmplt ポッケの中のおもちゃ @incmplt

ディスクの最適化問題は、元記事のソースを見ると "2004" アップデートに関係するみたいですね。
作業PCが 2004だけど、デフラグ切ってるし…立ち上げっぱなしなので影響少なかったのかも

引用
As originally reported by Bleeping Computer, and then TechRadar, Microsoft is currently scrambling to fix an update to Windows 10 (the 10 May 2020 "2004" update) that cocks-up the 'Defragment and Optimize Drives' tool.

t3.com/news/windows-10-update-