12 Oct
2018
12 Oct
'18
5:22 p.m.
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