GPT fdisk can convert GPT disk to MBR without data loss, by utilizing the inefficiencies in MBR partition scheme. How do I convert the disk losslessly to GPT without downloading large files, and preferably right from Windows PE? I can download small files from my phone and copy them to the USB drive, but the connection isn't stable enough for downloading a Linux Live USB or paid bootable partition manager. FDISK can easily convert MBR disk to GPT, but only if the disk is empty, while I need to keep the data on other partition, and don't have enough time nor space to back them up first. Since I don't have a working OS right now, Windows PE is my only hope. If I haven't remove the system partition, I can easily boot to Windows 7 and use third party tools to convert from there. The installer complaint about booting from UEFI and can't install on non-GPT disk. Wishing to just clean install Windows 10 while keeping the data on non-system partition, I made a mistake by booting from Windows 10 installer USB drive, removing the system partition right before trying to start the installation. I get an old laptop with Windows 7 installed.
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December 2022
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