NetBSD Installation on Sun Ultra 25

Hello All,

i have another machine with installation trouble...this time it is a
Sun Ultra 25.
I installed a 360GB SATA drive and installed NetBSD9 on it.
Installation detected the drive, partitioned it and there were no
apparent errors at all.

Then when everything was set up, i rebooted the machine and issued a
"boot disk".

The boot fails like this:

ok boot disk
Boot device: /pci@1e,600000/pci@0/pci@9/pci@0/scsi@1/disk@0,0   File and args:

NetBSD IEEE 1275 Multi-FS Bootblock
Version $NetBSD: bootblk.fth,v 1.15 2015/08/20 05:40:08 holland Exp $
.Inode not directory

The file just loaded does not appear to be executable.
ok

So my questions are:
Is this a known problem that i can avoid or correct somehow?
Is my harddisk too large? Are there any restrictions to it and would a
smaller one work?

Regards,
Connor