I have experianced this problem for many years with some low quality distros who never take into consideration external USB booting CDROMs for installation.
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Version after version the same problem persists and is never taken care off.

There is typically a two stage boot order in such distros. After booting the laptop (where there is no cdrom built-in and USB booting is available), the BIOS passes off control to the USB CDROM drive which loads the basic kernel of Antix from CD.
The kernel then needs to mount the CD to load everything else but can not find it since the necessary drivers to access the drive are unavailable.
All those people suggesting that CD is not burnt properly in cases of such ... tty errors should also check the same booting process by burning several Antix CD and will find the problem persists. try it good distros like Linux Mint and will find that no such error occurs. The bad writing of CDs is much less a possibility because I have tried 5 different CDs of Antix 8.2 burnt on different CD writers and at different speeds. It give the same error because of this idiotic 2 stage booting.

rocksolid,

If you could start your own thread with particulars about your hardware, and some specifics about your particular problem, not just criticizing, as that is not constructive nor does it encourage the fine people here to extend their free time to help you resolve your issue. There are several ways to boot antiX, installed to usb, unetbootin, fromiso, etc. With some decent input perhaps we can apply this to your situation.

cheers,
oldhoghead