[weblacky]

Zulu doesn't care about the format. Those extensions are for your feel good benefit. It doesn't treat them many different other than an iso means that it is a CD drive and the rest of them likely mean they're a hard drive.

So if you're emulating a CD drive with the correct, high-end version of Zulu that supports image files, you should be doing something like  CD4_512.iso for operating system installation media.

When you say commercial software you're creating an ambiguity that makes this unclear. SGI discs should be in the proprietary EFS disc image format I described. Other commercial software may be a standard iso 9660 CD file system. And those would definitely have a problem if they didn't use the normal 2048 CD sector size.

so you'll need to clarify what a commercial CD is. If you're talking about Maya and Photoshop and things like that they'll likely just be normal iso9660 CDs versus an EFS disk labeled image.

But there's no conversion here. As far as you're concerned their giant black box blobs. You're not converting anything to anything.