Unable to mount USB connected hard drive.

[Erik P. Olsen]

I've had this 1 TB drive for about 1 year and have been using it succesfully for backups
of my anf my wife's systems and suddenly yesterday morning I was unable to mount it.
Neither fdisk nor gparted can see it but lsusb can:

Bus 002 Device 003: ID 0bc2:ab26 Seagate RSS LLC Backup Plus Slim Portable Drive 1 TB

On trying to mount I get this error message:

mount: /backupdev: cannot read the superblock on /dev/sdc1

Is the drive a brick or can I perhaps regenerate the superblock somehow?