There are several things you could try and none guarantee success. Before doing a forced reformatting, if you are interested in the information of the dísco, I would try:
Listing the disk partitions with
sudo fdisk -l /dev/sdc
There you will list the partitions and you will know what the sdc2
is. Apparently it's 931GB.
You can also ignore the suggestion that ubuntu gives you and run
dmesg | tail
That I should give you something like:
[446381.305612] usb-storage 3-3:1.0: USB Mass Storage device detected
[446381.305755] scsi host6: usb-storage 3-3:1.0
[446382.333291] sd 6:0:0:0: Attached scsi generic sg2 type 0
[446382.334626] sd 6:0:0:0: [sdb] 62530624 512-byte logical blocks: (1000.0 GB/991 GiB)
[446382.335386] sd 6:0:0:0: [sdb] Write Protect is off
[446382.335389] sd 6:0:0:0: [sdb] Mode Sense: 43 00 00 00
[446382.335619] sd 6:0:0:0: [sdb] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[446382.357324] sdc: sdc1
[446382.358324] sdc: sdc2
[446382.358734] sd 6:0:0:0: [sdb] Attached SCSI removable disk
But with more information about the error.
To know the type of partition, you can execute:
sudo parted /dev/sdc
That will take you to a prompt where it says:
GNU Parted 3.2
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted)
There you press p
to print the disk information. I should tell you something like:
Disk /dev/sdc: 1000GB
Sector size (logical/physical): 512B/4096B
Partition Table: msdos
Disk Flags:
Number Start End Size Type File system Flags
1 1049kB 201MB 200MB primary EFI boot
2 201MB 932GB 931GB primary msdos
With that information (knowing that sdc2 is of type msdos
) you could try
sudo mkdir /mnt
sudo mount -t msdos /dev/sdc2 /mnt
If none of that happens, you'll have to try to reformat the disk. Check out this answer: link