One of the things with the rz25 is that there are at least two different
rz25's, rz25e and rz25l.  One is around 400 meg and the other is
500+ meg.  Run rzdisk on the the disk to find it's geometry.

  rzdisk -g current /dev/rrz1c

I took rzdisk's word on the number sectors/track and number of tracks
and got it to work.  One thing i did because of errors later on was
to make sure the partitions ended on cylinder boundaries.  

Ps: The first field is number of sectors per partition rather than
number of cylinders per partition, made that mistake too....

On Wed, 27 Nov 1996, Robert Rusek wrote:

> I am haveing the same problem with trying to label my RZ25.  Has a 
> solution been found to this problem?
> 
> After calculating the proper size of the RZ25 of 823608, because the 
> distributed /etc/disktab is wrong.  
> 
> I receive error message:
> 
> disklabel: ioctl DIOCSDINFO: Open partition would move or shrink
> 
> 
> Thank you in advance.
> 
> 
> ------- Forwarded Message Follows -------
> Date:          Mon, 25 Nov 1996 16:57:40 +0100 (MET)
> From:          pmax Port <netbsd@ascom.de>
> To:            Port Pmax <port-pmax@NetBSD.ORG>
> Subject:       Re: how to disklabel a RZ58 ??? 
> 
> On Mon, 25 Nov 1996, Luc Beurton wrote:
> 
> > #Hi,
> > #I have a running netbsd 1.2 on a 5000/133. I moved the disk to
> > #5000/240 and booted from it. So far, so good ...
> > #
> > #I then tried to disklabel a RZ58 disk with the command
> > #
> > #disklabel -w -B -b /usr/mdec/rzboot -s /usr/mdec/bootrz rz0c rz58
> > #
> > #I got the message 
> > #
> > #disklabel: partition c: partition extends past end of unit
> > #disklabel: partition f: partition extends past end of unit
> > #disklabel: partition h: partition extends past end of unit
> > #
> > #I used the following layout that came with the netbsd disktab.
> > #
> > #rz58|RZ58|DEC RZ58 Winchester:\
> > #        :ty=winchester:ns#85:nt#15:nc#2112:\
> > #        :pa#32768:oa#0:ba#8192:fa#1024:\
> > #        :pb#131072:ob#32768:bb#4096:fb#1024:tb=swap:\
> > #        :pc#2698061:oc#0:bc#8192:fc#1024:\
> > #        :pd#844800:od#163840:bd#8192:fd#1024:\
> > #        :pe#844800:oe#1008640:be#8192:fe#1024:\
> > #        :pf#844620:of#1853440:bf#8192:ff#1024:\
> > #        :pg#819200:og#163840:bg#8192:fg#1024:\
> > #        :ph#1715019:oh#983040:bh#8192:fh#1024:
> > #
> > # 
> > #Can anyone help ?
> > 
> > 85*15*2112=2692800
> > 
> > size of patition c,f,h are too big.
> > 
> > Luc.
> > 
> Before I used the original layout I tried an own one, causing 
> another error message, therefore I switched back to the original
> layout. Please notice the remarks regarding the RZ58 ....
> 
> # NOTE: The RZ58 uses a recording technique called zoned recording.
> #   Using this technique, the number of sectors per track will vary
> #   depending on what zone of the disk is in use (simply multiplying
> #   ns*nt*nc does not give true capacity of the drive).  The ns
> #   (number of sectors per track) is calculated by "ns = total
> #   sectors/(nt*nc)" and is a rounded value.  Therefore, the value
> #   "ns" is an approximation, not a true representation, of what is
> #   stored on disk.
> #   
> #   The 'c' partition listed below gives the true size of the RZ58
> #   (this information can be obtained by use of the DEVGETGEOM ioctl).
> #       
> rz58|RZ58|DEC RZ58 Winchester:\
>         :ty=winchester:ns#85:nt#15:nc#2112:\
>         :pa#65536:oa#0:ba#8192:fa#1024:\    
>         :pb#375000:ob#65536:bb#4096:fb#1024:tb=swap:\
>         :pc#2692800:oc#0:bc#8192:fc#1024:\
>         :pd#131072:od#440536:bd#8192:fd#1024:\ 
>         :pe#131072:oe#571608:be#8192:fe#1024:\ 
>         :pf#1990120:of#702680:bf#8192:ff#1024:\
>         :pg#781250:og#702680:bg#8192:fg#1024:\
>         :ph#1208870:oh#1483930:bh#8192:fh#1024:
> 
> error message:
> 
> disklabel: ioctl DIOCSDINFO: Open partition would move or shrink
> 
> 
> 
> Guenter Bernicken
> Ascom Infrasys GmbH      Charlottenburger Allee 61      D-52068 Aachen
> Bernicken@ascom.de   Phone: +49 241 96806 252   Fax: +49 241 96806 225
> 
> 
> ---
> Robert Rusek
> Systems Network Analyst
> Farleigh Dickinson University
> rusek@fdu.edu / RobRusek@aol.com
> ---------------------------------------------------------
> Thought for the day:
>     A penny saved is ridiculous.
> 
> ---------------------------------------------------------
>