Copying DEC VAX set up disks rx50, help

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