Disk /dev/sda1: 500.1 GB, 500117997568 bytes
255 heads, 63 sectors/track, 60802 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x69205244

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

     Device Boot      Start         End      Blocks   Id  System
/dev/sda1p1   ?       13578      119522   850995205   72  Unknown
Partition 1 does not end on cylinder boundary.
/dev/sda1p2   ?       45382       79243   271987362   74  Unknown
Partition 2 does not end on cylinder boundary.
/dev/sda1p3   ?       10499       10499           0   65  Novell Netware 386
Partition 3 does not end on cylinder boundary.
/dev/sda1p4          167628      167631       25817+   0  Empty
Partition 4 does not end on cylinder boundary.

Partition table entries are not in disk order