A 256 Meg dynamic random access memory is comprised of a plurality of cells organized into individual arrays, with the arrays being organized into 32 Meg array blocks, which are organized into 64 Meg quadrants. The abstract of the disclosure is submitted herewith as required by 37 C. The database cache is distributed over at least two data processing systems. Furthermore, while no security system is fool-proof, the system helps guards against the intentional, but unauthorized, dissemination of information to unauthorized receivers. In the dry clutch including a driving member 66 and a driven member 62 configured to be engaged with each other and disengaged from each other in a non-lubricating atmosphere to transmitintercept the motive power of the engine to a drive wheel, a solid lubricant 70 is interposed between the driving member 66 and the driven member 62. The washer body is press fit onto a shank of the nut body, with a head of the nut body embedded in a recess of the washer body.