

The Disks utility then displayed the partition /dev/sdc1 as "type unknown" and could not be mounted.I added "rw" to the mount options in Ubuntu's "Disks" utility and unmounted the drive.The next time I plugged in the hard drive, it was mounted as read only.I moved a few hundred GB of data to that partition, then safely removed it.As the partition belonged to root, I changed owner and group to my user.I deleted that partition and created a new ext4 partition using gparted (named Intenso5TB).I got a new external 5TB hard drive that was pre-formatted as FAT32 (named Intenso).I will try to list everything I did related to the problem: However, it also reported some errors (See 15.

Update: After running e2fsck -f /dev/sdc1, the disk was mounted and seems to be running normally. Testdisk finds the lost ext4 partition and is able to list containing files, but trying to write the partition structure to the disk does nothing.
