new friend: TestDisk

In this dark age of hard disks having moved away from 512-byte sectors to 4096-byte sectors yet preserving compatibility for older systems by presenting a 512-byte logical sector size, and yet with some USB enclosure deciding to bundle these logical sectors back into 4096-byte sectors, it seems common that moving an internal disk to a USB enclosure will lead to the partition(s) disappearing! Thanks to TestDisk (not sure it was really meant for that but well...), it's possible to rediscover the partition and write a new, working, GPT, with no data loss in the process.

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