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I have a great problem to deal: no access to Ubuntu through my VirtualBox. I always have the same error message :

Session failed to Open

Could not open the medium '/Users/me/VirtualBox VMs/Ubuntu/Ubuntu.vdi'.

VDI: error reading pre-header in '/Users/me/VirtualBox VMs/Ubuntu/Ubuntu.vdi' (VERR_DEV_IO_ERROR).

VD: error VERR_VD_VDI_INVALID_HEADER opening image file '/Users/me/VirtualBox VMs/Ubuntu/Ubuntu.vdi' (VERR_VD_VDI_INVALID_HEADER).

Code d'erreur : NS_ERROR_FAILURE (0x80004005)
Composant : Medium
Interface : IMedium {53f9cc0c-e0fd-40a5-a404-a7a5272082cd}

I tried to follow a guide on how to mount a vdi file. But I can't open my 6 GB sized file not even with HexFiend, or with 0exED.

How do I repair the pre-header ?

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