<p>A protective device ( 1 ) for protecting an optical head ( 2 ) of a disc drive unit against dirt and dust and shock when the disc drive unit is not in use comprises a carrier disc ( 5 ) similar to a music CD disc for engaging in the disc receiving area of the disc drive unit. A brush member ( 6 ) located on the carrier disc ( 5 ) at a position corresponding to the inner data track ( 10 ) of a music CD disc is provided for engaging a lens ( 3 ) and a peripheral portion ( 7 ) of a lens carrier ( 4 ) of the head ( 2 ) when the head ( 2 ) is in the inactive position for protecting the lens ( 3 ) and the peripheral portion ( 7 ) against dirt and dust. Fibers ( 15 ) of the brush member ( 6 ) embrace the lens ( 3 ) when the head ( 2 ) is in the inactive position.</p>
