NetBSD 3.0 install problem

Hi all,

I have just installed from the ISO images on the FTP site to a 512MB
flash disk (which used to have 2.0 installed). I simply re-formatted the
DOS and UFS partitions and unpacked the TAR files as I had done previously.

When I try to boot I see:

wd0: disk label corrupted
vfs_mountroot: can't open root device

yet I can hapily mount the same partition on my PC (using USB CF
adapter, NetBSD 3.0 running inside QEMU simulator on a Linux host).

Any ideas what could be wrong?

Thanks
Rich