All this is assuming you can still boot into Windows 11/10 in a regular way. If you cannot, the only way is to use a bootable USB drive. You can then use the advanced recovery. Reset Windows Format ...
The next step is to delete the OEM partition between the C: volume and your unallocated space. You'll need to use an old command-line tool for that. In Part 1, I showed you how to replace a hard drive ...
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