error in disk geometry

[melvin herrera]

   Hello, i need install freeBsd 5.2 in my hard disk. But fdisk program
   return a error "disk geometry invalid".

   The geometry of my disk  is 19769 cyls, 16 heads, 255 sectors.

   I introduce this values but fdisk does not allow its entrance?
   Help!!!

   Tanks
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References

   1. http://g.msn.com/8HMAES/2749??PS=