Meu caro entrei com o Live CD e quando cliquei no HD deu a seguinte mensagem
Unable to acess "750GB volume"
Error mounting /dev/sda1 at /media/ubuntu/ed31cb48-adae-461d-a780-c44151780815: Command-line `mount -t "ext4" -o "uhelper=udisks2,nodev,nosuid" "/dev/sda1" "/media/ubuntu/ed31cb48-adae-461d-a780-c44151780815"' exited with non-zero exit status 32: mount: wrong fs type, bad option, bad superblock on /dev/sda1,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so