yet another header reconstruction question

Quoted 4 lines

I tried dd on files to replace the first 512 bytes of a file , but the target file was completely replaced with this command :

dd if=512_bytes_with_fixed_header of=file_with_first_64_MB_of_md0 bs=512 count=1

When the target is a file, you need to include "conv=notrunc" so that the file will not be truncated to zero length when it is opened. That is not an issue when the target is a block device, but there is no harm in using "conv=notrunc" there, too.

Quoted 9 lines · Florian Dotzer

Quoted 4 lines

I tried dd on files to replace the first 512 bytes of a file , but the target file was completely replaced with this command :

dd if=512_bytes_with_fixed_header of=file_with_first_64_MB_of_md0 bs=512 count=1

When the target is a file, you need to include "conv=notrunc" so that the file will not be truncated to zero length when it is opened. That is not an issue when the target is a block device, but there is no harm in using "conv=notrunc" there, too.

Thanks to Bob , Arno , Sven and all others. I was able to remount with the corrected LUKS Header .

Now I have a backup of the header and a backup of the key.

currently I am backing up all data

Please enjoy a virtual drink of your choice ;-))

Sorry lsblk command was not available so I cannot report any output of that.

best wishes to all , Florian
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