> ### After fresh NetBSD/amd64 5.0 installation
 > # dmesg | grep sd0
 > sd0 at scsibus0 target 0 lun 0: <DELL, PERC 5/i, 1.03> disk fixed
 > sd0: fabricating a geometry
 > sd0: 5586 GB, 5720064 cyl, 64 head, 32 sec, 512 bytes/sect x 11714691072 
sectors
 > sd0: fabricating a geometry
 > sd0: mbr partition exceeds disk size
 > sd0: GPT GUID: 95027669-f71d-4a6f-9312-a1c4e5746c7e
 > dk0 at sd0: 4d4bdea5-b403-4de4-bf43-891756465be0
Sorry to be naive, but how did you get the dk0 device?  Are you using 
      options DKWEDGE_AUTODISCOVER
in your kernel.