Setting diks geometry on disk which has already data on it

[feczo at fw.hu]

Hi, I have a 80gig drive (it was operational
in another machine) connected through Promise
Ultra 133 TX2 at boot time it is detected as
155061/16/63 it contains a vinum drive, and
vinum reports its size is zero, I have traced b
ack the problem to the geometry
stand/sysinstall says it is more likely to be
9729 cyls/255 heads/63 sectors

How can I set this geometry without loosing data
on the disk .. (I couldnt find any possibility
to change geometry on the controller)
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