mpx@FX-4100-Linux:~$ sudo fdisk -l

Disk /dev/sda: 64.0 GB, 64023257088 bytes
255 heads, 63 sectors/track, 7783 cylinders, total 125045424 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000b4528

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      206847      102400    7  HPFS/NTFS/exFAT
/dev/sda2          206848    81922047    40857600    7  HPFS/NTFS/exFAT
/dev/sda3        81924094   125044735    21560321    5  Extended
/dev/sda5        81924096   117231615    17653760   83  Linux
/dev/sda6       117233664   125044735     3905536   82  Linux swap / Solaris

Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x76e29c3b

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1            2048  1596102655   798050304    7  HPFS/NTFS/exFAT
/dev/sdb2   *  1596109534  1679995295    41942881    5  Extended
/dev/sdb3      1701480448  1953523711   126021632   83  Linux
/dev/sdb5      1596109536  1679995295    41942880   30  Unknown

Disk /dev/sdc: 4009 MB, 4009754624 bytes
124 heads, 62 sectors/track, 1018 cylinders, total 7831552 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xa14d88bc

   Device Boot      Start         End      Blocks   Id  System
mpx@FX-4100-Linux:~$ sudo dd if=/dev/sdc bs=512 count=1 | hexdump -C
00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
1+0 oppføringer inn
1+0 oppføringer ut
*
512 byte (512 B) kopiert000001b0  00 00 00 00 00 00 00 00  bc 88 4d a1 00 00 00 00  |..........M.....|
000001c0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
, 0,00145932 s, 351 kB/s
000001f0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 55 aa  |..............U.|
00000200
mpx@FX-4100-Linux:~$ sudo mkfs.ext4 -L USB /dev/sdc1
mke2fs 1.42.5 (29-Jul-2012)
Could not stat /dev/sdc1 --- Ingen slik fil eller filkatalog

The device apparently does not exist; did you specify it correctly?
mpx@FX-4100-Linux:~$