Hmmm.  I had this disk drive that claimed to be a quantum 80s, but
if you booted with it under sunos4.1.3_U1+, it said:
sd3:	corrupt label - bad geometry
sd3:	Label says 169932 blocks, Drive says 164139 blocks.

Would be nice to have such messages with netbsd -- instead of getting
disk errors when it read beyond the end of the disk upon booting -- and
seeming to work otherwise.