Other Help Topics :: adding .tar.gz

I tried to change ownership of a folder in /cdrom on my usb drive, but it said "operation not permitted" though I was logged in as root. Can I have any help with this?

It's probably mounted read-only. If you boot a frugal system with the "frugal" boot option, you should be able to modify files in /cdrom. If not, try accessing the drive through /mnt/whatever-it-is.

original here.