slice vanishing

[J. W. Ballantine]

Hi,

I've been running BSD, for several versions, as a VMWARE client on
a persistant disk.  Recently, following an update to 6-stable/pre-release,
the label for slice that the system was on has been removed.  When I
try and boot the system, it reads and loads the kernel but it fails
when it trys to mount the file system.

Is this an issue with 6-prerelease, VMWARE, or some interaction between
the two?

Any ideas are appreciated.

Thanks

Jim