DG/UX install media

[Chris Hanson]

On Oct 11, 2018, at 8:02 AM, Sophie Haskins via cctalk <cctalk at classiccmp.org> wrote:
> 
> I'm pretty sure these are just raw images, as Torfinn suggested.

Sophie is correct. What’s commonly referred to as an ISO is just a raw dump of the bytes on a volume; there’s no imposed structure, no imposed file headers, nothing like that. Some people would like it to mean “an image of an ISO-9660 filesystem” but that’s almost never been the case.

For example, an “ISO” of a Silicon Graphics installation CD-ROM will probably start with the Irix volume header, rather than anything ISO-9660 related.

So if you get something calling itself an ISO, you need to know its provenance before you can actually do anything with it, because even if it’s a dump of the bytes on a CD-ROM, it has no formal structure.

  -- Chris