[syslinux] Undo isohybrid possible?

[H. Peter Anvin]

Michael Prokop wrote:
> Hi,
> 
> is it possible to undo a "isohybrid filename.iso" so you get the
> original ISO back?
> 

This should do it for most mastering software:

dd if=/dev/zero of=image.iso bs=512 count=1 conv=notrunc

If you have special mastering software which puts its own data in the
System Area, then no, you won't get your original System Area back.

	-hpa