fdisk -l /dev/sdb
Note: sector size is 2048 (not 512)

Disk /dev/sdb: 995 MB, 995622912 bytes
31 heads, 62 sectors/track, 252 cylinders
Units = cylinders of 1922 * 2048 = 3936256 bytes

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

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   ?      404858      998775  2283019262   72  Unknown
Partition 1 has different physical/logical beginnings (non-Linux?):
     phys=(357, 116, 40) logical=(404857, 12, 11)
Partition 1 has different physical/logical endings:
     phys=(357, 32, 45) logical=(998774, 30, 51)
Partition 1 does not end on cylinder boundary.
/dev/sdb2   ?       87768     1095067  3872056480   65  Novell Netware 386
Partition 2 has different physical/logical beginnings (non-Linux?):
     phys=(288, 115, 43) logical=(87767, 21, 47)
Partition 2 has different physical/logical endings:
     phys=(367, 114, 50) logical=(1095066, 14, 42)
Partition 2 does not end on cylinder boundary.
/dev/sdb3   ?      972884     1980182  3872056384   79  Unknown
Partition 3 has different physical/logical beginnings (non-Linux?):
     phys=(366, 32, 33) logical=(972883, 5, 30)
Partition 3 has different physical/logical endings:
     phys=(357, 32, 43) logical=(1980181, 28, 39)
Partition 3 does not end on cylinder boundary.
/dev/sdb4   ?     1501395     1501424      110998    d  Unknown
Partition 4 has different physical/logical beginnings (non-Linux?):
     phys=(372, 97, 50) logical=(1501394, 30, 25)
Partition 4 has different physical/logical endings:
     phys=(0, 10, 0) logical=(1501423, 26, 33)
Partition 4 does not end on cylinder boundary.

Partition table entries are not in disk order