| http://www.w3.org/ns/prov#value | - The disc cartridge of claim 18, wherein the locking mechanism includes: a locking hole that is formed through the disc cartridge body; and a locking protrusion portion that is provided at one of the shutters so as to engage with the locking hole when the shutters are located at such a position as to cover the chucking opening and the head opening.
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