If I try 'disk' instead of 'disk1' I get a different behavior: Rebooting with command: boot disk:b Boot device: /sbus/espdma@e,8400000/esp@e,8800000/sd@0,0:b File and args: NetBSD IEEE 1275 Bootblock . Fast Data Access MMU Miss -- Manuel Bouyer, LIP6, Universite Paris VI. Manuel.Bouyer@lip6.fr --