I am not expert and need a patient guide. History of events:
- Only XP in internal disk with documents on a seagate 500Gb
- Installed Ubuntu by partitioning external disk and booting from it
- During XP use, seagate repeatedly autorun and making a click sound. Ubuntu no longer accessible.
- Internal hard disk partitioned and Xubuntu installed. Xubuntu FileSystem can only see one of the partitions on seagate, which contains a folder Lost&Found but won't let me access it because it is owned by Root and when i open a terminal window and type "su" i get Authentication failure when i type in the only password i have ever given it. Yet i can install new packages with Administrator password.
- Testdisk can't see any partitions on seagate disk !!