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without realising it, I formated my external (95% full with data) to a single GPT:NTFS file system. It's important to understand that you did three entirely different things here: You converted the disk from whatever partition table type it used (probably MBR) to GPT. You created at least one new partition on the disk, replacing whatever partition(s) ...


Windows ties its boot mode to its partition table type: Windows boots from MBR disks only in BIOS mode and from GPT disks only in EFI mode. Thus, to boot from your disk as it is now, you must install an EFI-mode boot loader. This also means that your computer must have EFI firmware (as do most machines introduced since mid-2011). Here's a blog post that ...

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