If you want to restore a 3390 image from "something" and the something has to be portable, use TRACKREAD and TRACKWRITE. PIPEDDR is based on that pair of stages. I've also rolled my own.
Take a working disk, slurp the image with TRACKREAD, use 'BLOCK CMS' or some other record-to-stream encoding and then run it through 64ENCODE. Do the reverse when installing but with TRACKWRITE on the end (obviously). Note that TRACKWRITE is "careful". It won't step on a label that it does not expect. If you want to blow away the target disk, you'll need to format it outside of TRACKWRITE. I use CMS FORMAT. -- R;
