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    Thanks, the troubling thing is: This is not a new disk, I have been using it for almost a year and I'm absolutely certain that there is (or was) an ext4 volume in there. Commented Apr 25, 2014 at 20:49
  • @Hamza - the lack of a /dev/sda1 in dmesg means the kernel is not auto detecting any useful filesystem on it. Do you have other EXT4 devices mounted? That would confirm that the drivers are available/working so that EXT4 devices can be mounted. Commented Apr 25, 2014 at 20:51
  • Yes, there are four other disks with a number of ext4 partitions mounted on the same machine. Commented Apr 25, 2014 at 20:53
  • @Hamza - output of sfdisk -l? Commented Apr 25, 2014 at 20:56
  • Disk /dev/sda: 364801 cylinders, 255 heads, 63 sectors/track Warning: The partition table looks like it was made for C/H/S=*/256/63 (instead of 364801/255/63). For this listing I'll assume that geometry. Units = cylinders of 8257536 bytes, blocks of 1024 bytes, counting from 0 Device Boot Start End #cyls #blocks Id System /dev/sda1 0+ 45422- 45423- 366283322+ ee GPT /dev/sda2 0 - 0 0 0 Empty /dev/sda3 0 - 0 0 0 Empty /dev/sda4 0 - 0 0 0 Empty Commented Apr 25, 2014 at 21:04