My mother comes into my room, and asks me if a rewritable cd can ever be "locked" so that it can't be changed. I tell her probably not, unless you mean lock in the sense of "destroy". Then she tells me that my sister seems to have "locked" her RW cd.

I go and get the cd, pop it into my burner, and see that I can write/erase data. (I didn't actually try, cause.. well you know).

I go to my sister and tell her it looks like it's working fine. She tells me it isn't because she can't seem to erase the disk. I tell her to put it in her burner and I'll show her how.

She then opens her mouth and says:
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"I don't have a burner."