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    For more on this subject, see the official GPT fdisk documentation on such conversions.
    – Rod Smith
    Commented Sep 24, 2017 at 13:57
  • Something's not right. In gdisk recovery and transformation options the g option will only recreate the protective MBR on top of the GPT but not actually convert the disk to GPT. The right way to convert a GPT disk to MBR is using fdisk o option but it does destroy data on the disk. Commented Oct 18, 2019 at 14:06
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    I observed this behaviour with gdisk v1.0.3 and fdisk from util-linux 2.33.1 when I was trying to convert an empty GPT disk (no partitions) to MBR Commented Oct 18, 2019 at 14:17
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    This successfully converted my disk back to MBR but did not mark the Windows partition as Active and the disk was not bootable. I ended up using DISM to clone the Windows partition after doing a fresh install to restore the structure of the disk while preserving data. Commented Aug 22, 2022 at 20:21
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    After this r -> g command, you still need to use w to write and quit. Until then, it seems nothing has happened yet (verify in another terminal with e.g. fdisk -l /dev/sdx).
    – Luc
    Commented May 6, 2023 at 23:56