ubuntu@ubuntu-VirtualBox:~$ sudo fdisk -l

Disk /dev/sda: 19.3 GB, 19327352832 bytes
255 heads, 63 sectors/track, 2349 cylinders, total 37748736 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: 0x0001470d

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048    36702207    18350080   83  Linux
/dev/sda2        36704254    37746687      521217    5  Extended
/dev/sda5        36704256    37746687      521216   82  Linux swap / Solaris

Disk /dev/sdb: 3933 MB, 3933732864 bytes
122 heads, 62 sectors/track, 1015 cylinders, total 7683072 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: 0xffffffff

Disk /dev/sdb doesn't contain a valid partition table

Disk /dev/sdc: 15.9 GB, 15931539456 bytes
255 heads, 63 sectors/track, 1936 cylinders, total 31116288 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: 0x00000000

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1            8192    31116287    15554048    c  W95 FAT32 (LBA)
ubuntu@ubuntu-VirtualBox:~$ sudo dd if=/dev/sdb of=orig_image.bin bs=512 count=$((0xF000))
dd: reading `/dev/sdb': Input/output error
30944+0 records in
30944+0 records out
15843328 bytes (16 MB) copied, 226.33 s, 70.0 kB/s
ubuntu@ubuntu-VirtualBox:~$