cgsecurity.org

Finally figured it out. Simply had to delete the partition using fdisk and create a new one of the proper length. The tricky part was to get fdisk to let me pick sectors < 2048. Starting it in old DOS-style disk block addressing mode via the "fdisk -c=dos -u=cylinders /dev/sdf" command did the trick ...

I'm not exactly sure how this happened but the partition table of one of my LUKS encrypted drives was lost although I saw using a hex viewer that the LUKS header is completely intact. I think it might been when I was installing Manjaro Linux and messed something up while partitioning or installing ...