The 2TB disk that I use as an encrypted backup, is now reported by Ubuntu as being just free space. The encryption was setup as a LUKS encrypted device.
The output of
sudo fdisk -l reports:
Disk /dev/sdc: 2000.4 GB, 2000398934016 bytes 255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x6b6edeba Device Boot Start End Blocks Id System
Note that there is no partition information reported (there was only one partition on the disk).
Trying to open the disk with
sudo cryptsetup luksOpen /dev/sdc crypt1 returns the error:
Device /dev/sdc is not a valid LUKS device.
Now luckily I have backups of the backup, so I can live with the data being going this time, however I need to know: What caused it and/or how I can fix it, because otherwise I can't trust my backup to be there in the future and I will have to find a different solution.
This is on
Ubuntu 14.04.3 LTS.