A seed retaining member has a recessed portion for breaking and separating formed at an arbitrary location and thereby allows stress concentration to occur at the recessed portion when applying a breaking load, to enable the seed retaining member to break with a smaller load than conventional. Each filter element can receive a liquid having electrically conducting properties and X-ray absorbing properties, the value of the X-ray absorption of the filter element being dependent on the level of the X-ray absorbing liquid in the filter element. In a particular embodiment, initialization may also include deriving and protectively storing identifying characteristics of the trusted software. The method is characterized in that these the client processes write or read or modify information called exchange data in at least one common part, of the addressable memory of the hardware platform. The groove pitch a is set to a range of 0.