After some more searching, it appears that the whole disk
device suffix has changed from 'c' to 'd' and as such if
I use /dev/rwd1d as the destination, it doesn't complain.
I'll know more after it completes in a few hours.

Sorry to bother people with stupid questions...

--tnx
--tom

>I have a pair of IDE hard drives and I want to do a raw copy
>from one to the other, so I thought that I might just run the
>3.0 install CD shell and dd from rwd0a to rwd1a. I know that
>back in the dark ages, this was possible, but apparently in
>these modern times things have changed. When I try to do this
>I receive a read only error on the /dev/rwd1a device.
>
>When the PC boots, the wdX information goes by to quickly to
>read and the dmesg command is not present on the install CD
>image.
>
>Is what I want to do possible (anymore)?
>
>FWIW: I experimented with linux doing this as well and it
>appears that linux does not have a raw disk I/O capability
>by default. After doing a bit of searching, I discovered that
>there is some sort of rawio extention which allows a raw
>device to be associated with a block device, but it also
>said that dd would not work with this raw device due to
>buffer alignment issues vs. DMA. Go figure...
>
>--tnx
>--tom