Disk /dev/sda: 2021 MB, 2021654528 bytes
63 heads, 62 sectors/track, 1010 cylinders
Units = cylinders of 3906 * 512 = 1999872 bytes

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

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   ?      199216      491461   570754815+  72  Unknown
Partition 1 has different physical/logical beginnings (non-Linux?):
     phys=(357, 116, 40) logical=(199215, 34, 11)
Partition 1 has different physical/logical endings:
     phys=(357, 32, 45) logical=(491460, 44, 51)
Partition 1 does not end on cylinder boundary.
/dev/sda2   ?       43188      538843   968014120   65  Novell Netware 386
Partition 2 has different physical/logical beginnings (non-Linux?):
     phys=(288, 115, 43) logical=(43187, 17, 47)
Partition 2 has different physical/logical endings:
     phys=(367, 114, 50) logical=(538842, 14, 42)
Partition 2 does not end on cylinder boundary.
/dev/sda3   ?      478721      974376   968014096   79  Unknown
Partition 3 has different physical/logical beginnings (non-Linux?):
     phys=(366, 32, 33) logical=(478720, 18, 30)
Partition 3 has different physical/logical endings:
     phys=(357, 32, 43) logical=(974375, 14, 39)
Partition 3 does not end on cylinder boundary.
/dev/sda4   ?           1      931190  1818613248    d  Unknown
Partition 4 has different physical/logical beginnings (non-Linux?):
     phys=(372, 97, 50) logical=(0, 0, 1)
Partition 4 has different physical/logical endings:
     phys=(0, 10, 0) logical=(931189, 36, 30)
Partition 4 does not end on cylinder boundary.

Partition table entries are not in disk order