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Create a Bootable USB Recovery Drive in Windows 10 - TIPS
1. Pay attention to the numerous warnings to create a recovery drive before a failure.
2. Use a 32gb USB stick formatted as NTFS - even though there is lots of advice to use 16gb formatted as FAT32.
My creation of recovery drive failed twice after several hours until I tried 32gb NTFS in desperation.
My PC was running desperately slowly while using 89-100% cpu. I spent many hours tweaking before concluding that I needed to do a complete reinstall.
Creating the recovery drive took 12 hours + several hours for failed attempts. This would have been a lot faster if I had done it when the PC was healthy.
Booting from recovery drive and then letting Win10 configure itself only took 1 hour - and the result was a perfect machine!
Windows 10 Home (x64) Version 1909 (build 18363.1139)
It took a lot of searching to discover that on my Lenovo Ideacentre 520 it was necessary to keep pressing F12 to boot from USB.