On Wed, 29 May 2002, Andy R wrote:

> A ha! I've had lots of msdosfs data going bad lately
> (including a few gigs of personal info that I was
> attempting to back up, but I found that the compressed
> file was bad like you say). I mount my msdosfs
> filesystem read only at boot, but sometimes I unmount
> it and re-mount it readwrite to copy some stuff to it.
>
> Anything I can do to help?

Stephen Ma supplied me with a patch that appears to have solved the
problem (it was some old code that wasn't converted over to UBC).  See
kern/17143 for the patch, hopefully it'll solve your problem too.

Rick