Disk /dev/sda: 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: 0xd5f7cc89

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1              63       80324       40131   de  Dell Utility
/dev/sda2   *       81920    30801919    15360000    7  HPFS/NTFS/exFAT
/dev/sda3        30801920  1893104930   931151505+   7  HPFS/NTFS/exFAT
/dev/sda4      1893105662  1953523711    30209025    5  Extended
/dev/sda5      1893105664  1953521663    30208000    7  HPFS/NTFS/exFAT

Disk /dev/sdb: 8004 MB, 8004304896 bytes
247 heads, 62 sectors/track, 1020 cylinders, total 15633408 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: 0x20ac7dda

This doesn't look like a partition table
Probably you selected the wrong device.

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   ?  3224498923  3657370039   216435558+   7  HPFS/NTFS/exFAT
/dev/sdb2   ?  3272020941  5225480974   976730017   16  Hidden FAT16
/dev/sdb3   ?           0           0           0   6f  Unknown
/dev/sdb4        50200576   974536369   462167897    0  Empty