Gregory Smith wrote:

> 	I recently came across a Decstation 3000/400 I would like to install
> NetBSD on. I've moved the hard drive to another DECstation running
> port-pmax, and tried to dd the install image onto it. I'm getting this
> error message:
> 
> > dd if=cdhdtape bs=16k of=/dev/rz1c
> dd: /dev/rz1c: Read-only file system
> 
> 	Must I prepare the disk in some way? It's currently disklabelled with one
> partition rz1a filling the whole disk, in addition to rz1c
> 	Thanks much

This is really a port-pmax question :-)

Try:

	disklabel -W rz1
	dd if=cdhdtape bs=16k of=/dev/rz1c

Until very recently (in the last week) the disklabel area of the disk is
write protected unless told otherwise by disklabel(8).  The -W enables
writing to the label area.

Simon (a pmax guy hanging out on port-alpha :-)