Knoppix is one kind of Linux distribution that can boot from CD or DVD. It is useful when the OS get crash. Well, following site providing the USB bootable Knoppix. Recent CD/DVD bootable linux can not overwrite all data to there media (without others data media) However,we can write the some data if it can be booted from USB memory stick. http://kosuge.or.tp/kserv/index.html Actually, I have not used it, yet.... If some one use it then let me know about it, please.
I don't know....... You don't know........who know.....???