Dual File Structure CD for RT-11

I'm pretty certain that at least one VMS engineer participated in the standards process for ISO9660. I've also heard that, as a result, this ability to have ISO9660 and A.N.Other file structure not tread on each other is NOT an accident! Of course, said engineer was almost certainly thinking of ODS rather than the RT-11 file structure (does that have a name?). If you look at http://support.tditx.com/~odsiso/index.html you'll find a toolset that allows you to do something similar with ODS-2 and ISO9660 i.e. have 600MB+ of data accessible in native for both via an ISO9660 directory structure and via an ODS-2 structure. It works (IIRC) by building the ISO9660 image using mkfsiso and then analysing mkfsiso's log file to find where the files are and creating the mapping info that ODS-2 needs (or it may be the other way around - it's been a while since I used it). So you *may* be able to automate (or semi-automate) your existing process. It does look like ODS-2 and RT-11 FS cannot co-exist, however, since they both want to use the 64 blocks at the start of the image, unless it's possible that the unnecessary fields in each of those two formats can be persuaded to step out of each others way. Do you have any details about exactly what RT-11 requires in that area? Maybe a disk that boots on PDP-11, VAX (VMS), Alpha (VMS) and PC is possible after all :-) Antonio -- --------------- Antonio Carlini arcarlini(a)iee.org