Problem after upgrade, please help

[scuba at centroin.com.br]

Hi all,

 	I'm in trouble here.
 	I did an upgrade via Boot CD, from FBSD 5.4 to 6.1 that finished 
without errors. But after the reboot, I discovered that the disk partition 
has gone.
 	The original disk had two partitions, one DOS (20GB) and the other 
FBSD (60 GB), selectable via FBSD boot manager.
 	Since I don't have a backup of the original disk labels, how can I 
recover my partitions?

Thank you,

- Marcelo