In the optical disk apparatus, an arbitrary seed data for randomizing is added to an original data to be recorded on a disk. Score lines are formed in both structures to form a flap that is lifted to open the package. Also provided is a method for making a heat-shrinkable polymer foam tubing. Thus, a degree of compressibility can be related to a degree of wetness of a cleaning brush, which provides data that allows an operator to determine when the cleaning brushes are wet enough to send a wafer through the cleaning apparatus without incurring unnecessary damage. The turntable device is good for e.