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I started off with one disk, and it was a basic disk. I partitioned it to install Windows 8.1, then ran out of space, so I made another partition, and extended my Windows 8 partition into that. But then, Windows 8 stopped booting, and that was because my disk had now become a dynamic disk.

I want to convert it back to a basic disk, but still keep all my data. (I've uninstalled Windows 8)

It would be preferable to not install any 3rd-party software or freemium stuff.

Brandon
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Several times I managed to convert a dynamic disk back to basic by using testdisk. Just run it, choose Intel partition table, let it scan the disk and detect existing partitions. Then write the partition table. This will recreate a standard partition table and the disk will be detected as basic. You can try to run testdisk under WinPE or you can boot Knoppix - testdisk is available in the standard image.

You can find more details in answers to this question.

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