[uae] Hardfiles

Maybe it's a topic that's been discussed tousends of times... but what have
I to do in order to use an hardfile with UAE?

I created a work.hdf with the command:
dd if=/dev/zero of=hardfile bs=512 count=1048576

Then I added in .uaerc:
hardfile=rw,20,2,2,512,/path/to/work.hdf

But that doesn't seem to work (it gives errors in parsing the configuration
of filesystems/hardfiles).
What am I doing wrong?

I tried it with yesterday cvs snapshot.
Thanks

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