I have a big problem with a partition that is encrypted with luks/dm-crypt. I recognized that some files were not readable any more. I rebooted and the partition was not mountable. As far as I remember there was a non-encrypted partition and behind that the luks/dm-crypt partition (formatted) with ext4 on that harddisk. There was no operating system installed on that harddisk. I was not doing any critical stuff, just working normally, surfing the web etc.

In the gnome-disks utility it shows only "free space" and under "partitioning: unknown (PMBR)". Parted says "Unknown partition table ". fdisk finds a partition: /dev/sdj1 1 4294967295 4294967295 16T ee GPT" which is obviously wrong.

The hard disk is a ST3000DM 001-1CH166 (CC27)

I'm using arch-linux and didn't boot windows for some time.

I now removed the harddisk from the computer and put it into an external usb case, still the same. I am now doing a copy of the harddisk with dd to play around with the image.

What could have possibly gone wrong? Is there a way to recover the data on the encrypted partition?

Update: Luckily I was able to mount the image created with dd:

  • sudo losetup -Pf data.img

  • sudo cryptsetup luksOpen /dev/loop0p1 image

  • sudo mount /dev/mapper/image /mnt

With that I am able to access all the data.

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