Yes. Standard CD-R capacity is 700 MB. The ISO is typically ~590 MB.

No, not natively. Use USB 2.0 ports. Alternatively, create a bootable USB with a newer PE like Gandalf’s or Sergei Strelec’s.

While newer PE (Preinstallation Environment) versions exist, version 11.0 remains a favorite for technicians working on legacy hardware or those who prefer its specific lightweight environment.