Disk /dev/sdb: 3933 MB, 3933732864 bytes
122 heads, 62 sectors/track, 1015 cylinders
Units = cylinders of 7564 * 512 = 3872768 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x6f20736b

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

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   ?      102874      253788   570754815+  72  Unknown
Partition 1 does not end on cylinder boundary.
/dev/sdb2   ?       22302      278255   968014120   65  Novell Netware 386
Partition 2 does not end on cylinder boundary.
/dev/sdb3   ?      247209      503161   968014096   79  Unknown
Partition 3 does not end on cylinder boundary.
/dev/sdb4   ?      381503      381510       27749+   d  Unknown
Partition 4 does not end on cylinder boundary.