Abstract: A method for managing a secondary storage device connected to a computer system having a primary storage device includes hooking a partition session selector device driver in a layered drive structure. An application programming interface call to obtain information related to storage devices connected to the computer system is then performed. The application programming interface call is trapped and the partition session selector device driver is communicated with directly via an interface call to manage a user accessible representation of the primary and secondary storage devices.

Abstract: A clock distribution circuit is provided with a plurality of blocks each having a plurality of circuits, a first clock driver which distributes a clock signal to each of the blocks, and second clock drivers each provided in one of the blocks. Each second clock drivers distributes the clock signal to each of the circuits in the block. A first wiring is connected between the first clock driver and each of the second clock drivers so that the clock signal arrives at each of the second clock drivers in the same phase. A plurality of second wirings are connected between the second clock drivers and each of the circuits in the block. The second wirings may consist of transmission lines. The second wirings have a maximum length equal to or smaller than a product of clock skew allowable and a propagation velocity of an electromagnetic wave propagating through the second wirings.