How come when I saved my word doc. on disk; it became read only?

Answer 1

Probably went read only by default. You can right click the file and open properties and return it to archive status by clicking the archive box and hitting the O.K. box

Answer 2

If you burned it onto a disk that is not rewriteable then it can only be read-only because you can no longer edit it! If you'll copy it from that dvd/cd back to a computer, then you'll be able to change it (if needed) so you can edit it again.... good luck :-)