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The read error Testdisk found combined with your description suggests that your drive may be dying.

Please post your smartmontools log file as explained here:

https://forum.cgsecurity.org/phpBB3/viewtopic.php?f=5&t=109

Depending on the outcome duplicating the disk using ddrescue as described in ...

Thanks for your answer, it might yes, but Im thinking there is about 120go missing, probably because i did something wrong playing with TestDisk, is it not possible to recover the whole partition first, to see if the files are not usable, savable? I have about 800go of this disk saved to another one ...

Hello,
Im new to TestDisk and found a bit difficult to know what to do to get my partition back. I'll try to give all informations I have to help you give me advices.
Im on a Macbook M1, updated to last system and softwares. I was using a Toshiba 2To hard drive, that I thought was SSD but its HDD ...