My external WD USB 320 Gb HDD looks an empty FAT32 partition after an accidental formatting using a create-boot-USB Ubuntu tool. It is recognisable, readable and mountable but empty although it's almost full of data (about 300 Gb).
Testdisk can see it but after adding it to the partition table nothing changes - it still looks as an empty FAT32 partition.
Restoring an original partition is awfully desirable.
But how?!