error mounting USB disk: Invalid argument

[Colin Brace]

Hi all,

I am having difficulties mounting a USB drive under 7.0-STABLE. Running
sysinstall, I can create a partition and format it. But sysinstall is
unable to mount it:

Error mounting /dev/da0s1d on /media/disk6 : Invalid argument

The same error ocurrs when I try to mount it manually on the command line.
I have tried various mount points, to no avail. 

Anyone have any ideas what is going wrong?

Thanks.

-- 
  Colin Brace
  Amsterdam
  http://lim.nl