Copying DEC VAX set up disks rx50, help

[g-wright at att.net]

Hi,

 I have a stack of  the orginal VAX  Disks (console and
set up , 5 1/4 RX50 )  The ones in front of  me are
for a 8200 series.   I would like to copy them but  can't
get image disk to work. Is this possible or do I have to 
use a VAX..  I  have RT11 on a micro PDP-11 with a RX50
and I think my professional still works.   But would  really like to 
get it on a better media for long term storage.  

Image Disk reads it with out errors
0/0: 300k DD 10 sectors of 512 bytes - G1:9 G2:17
0/1: Single sided
0/0: Single Step
800 sectors (800 data, 0 compressed, 0 unaval)
Read complete


Trying to write and it has errors from the get go.
0/0: 300k 10  sectors of 512 bytes
 :format error <0> overun
 :write error    <2> no sector
 and on .............................

written on a PC with 1.2 HD drive
Tried on another 1.2 and on a 360k drive 
all capable of SD .

I tried  both HD  and DD  disks . all bulk erased first.


Thanks, Jerry