Disk /dev/sda: 1047 MB, 1047525376 bytes
33 heads, 61 sectors/track, 254 cylinders
Units = cylinders of 2013 * 2048 = 4122624 bytes

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

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   ?      928849     1012649   337379044   69  Unknown
Partition 1 has different physical/logical beginnings (non-Linux?):
     phys=(68, 13, 10) logical=(928848, 5, 37)
Partition 1 has different physical/logical endings:
     phys=(288, 115, 43) logical=(1012648, 7, 36)
Partition 1 does not end on cylinder boundary.
/dev/sda2   ?      845266     1774169  3739762930   73  Unknown
Partition 2 has different physical/logical beginnings (non-Linux?):
     phys=(371, 114, 37) logical=(845265, 16, 61)
Partition 2 has different physical/logical endings:
     phys=(366, 32, 33) logical=(1774168, 12, 30)
Partition 2 does not end on cylinder boundary.
/dev/sda3   ?           2           2           0   74  Unknown
Partition 3 has different physical/logical beginnings (non-Linux?):
     phys=(371, 114, 37) logical=(1, 9, 12)
Partition 3 has different physical/logical endings:
     phys=(372, 97, 50) logical=(1, 9, 11)
Partition 3 does not end on cylinder boundary.
/dev/sda4               1     1706465  2575259648    0  Empty
Partition 4 has different physical/logical beginnings (non-Linux?):
     phys=(0, 0, 0) logical=(0, 0, 1)
Partition 4 has different physical/logical endings:
     phys=(0, 0, 0) logical=(1706464, 23, 37)
Partition 4 does not end on cylinder boundary.

Partition table entries are not in disk order