I have an old IBM ThinkPad laptop 560Z, which does not have a floppy
disk nor a CD rom drive. I have installed Red Hat 7.2 on it years ago.
Now I would like to try DSL or Knoppix or even Fedora 9 Live CDs. Is
it possible that I load the Live CD image (an .iso file) to hard disk
and then modify my old Grub setup so that I could boot the Live CD
image from the .iso file on my hard disk?

Or can 560Z boot a LiveCD from USB memory using the grub on the hard
disk? 560Z can't boot from USB memory.