An inkjet printhead squeegee is split on one side so that its wiping force on a printhead is highest on the front stroke and much lighter on the backstroke when the surface is dry. The shroud includes a rear converging wall cone and a front diverging wall cone. Accordingly, it is possible to provide a magnetic tape cassette which, even if shocks are given to a lid due to drop of the magnetic tape cassette, is surely able to prevent the lid against damage. A carrier frequency generator generates a carrier frequency substantially at a harmonic of the identified noise component.