Fujitsu Corporation

Hideyuki Akimoto

Iwao Okamoto

Kenji Sato

Yuki Yoshida

Masaya Suzuki

Susumu Yoshida

Tsuyoshi Hashimoto

Akira Kikuchi

Chiaki Okuyama

Masayoshi Shinohara

Tohru Horie

Akiko Honda

Naoya Saito

An information processing device includes a processor that calculates a first energy consumption of a first computer during a boot latency when the first computer has already booted and is not executing any job. The boot latency is time taken for boot of a second computer scheduled to execute a second job with the first computer after a first job executed by the first computer. The processor calculates a second energy consumption of the second computer during a waiting time when the second computer has already booted and is not executing any job. The waiting time is obtained by subtracting the boot latency from a time difference between a scheduled end time of the first job and a present time. The processor powers on the second computer when power of the second computer is off and when the second energy consumption becomes equal to or less than a threshold value.

Information processing device and method of controlling computers

A data transfer control apparatus controls transfer of data from a plurality of first nodes included in a first region in a network to a plurality of second nodes included in a second region in the network. A control unit of the data transfer control apparatus generates an n-dimensional Latin hypercube in which the number of symbols in each dimension is a value in keeping with a size of the first region. The control unit then associates, in accordance with respective positions of the first nodes in the first region, each first node with a symbol at a corresponding position in the Latin hypercube. The control unit then instructs the first nodes so that parallel data transfers by a plurality of first node sets, where first nodes associated with a same symbol in the Latin hypercube are grouped, are executed in order in first node set units.

Data transfer control apparatus that control transfer of data between nodes and parallel computing system

A glass substrate for a magnetic recording medium has a textured surface having numerous grooves extending in the circumferential direction of the glass substrate. The average roughness of the textured surface is 0.4 nm or less. The number of the grooves is 15 or more per micrometer. The average depth of the grooves is 2 nm or less. The grooves are formed by mechanical texturing using a texturing liquid applied between a texturing tape and the surface of a blank glass substrate rotating. The texturing liquid is an aqueous dispersion of fine diamond abrasive grains.

Glass substrate for magnetic recording medium, and magnetic recording medium

A magnetic recording medium for high areal recording density that has excellent thermal fluctuation resistance and recording/reproduction characteristics, and a method of producing the same. The magnetic recording medium includes a glass substrate, an NiP layer having an oxide film on its surface provided on the glass substrate, a ground layer provided on the NiP layer, and a nonmagnetic intermediate layer provided on the ground layer. The magnetic recording medium further includes an exchange layer structure composed of a ferromagnetic layer and a nonmagnetic coupling layer provided on the nonmagnetic intermediate layer, and a magnetic recording layer provided on the exchange layer structure. The oxide film on the NiP layer is formed by introducing a small quantity of oxygen into a vacuum chamber of a sputter device. The formation and oxidation of the NiP layer are conducted at a temperature of not less than 140&deg; C.

Magnetic recording medium with an exchange layer structure including a CoCrPtB ferromagnetic layer

A magnetic recording medium has a construction in which on a non-magnetic support member are successively stacked a seed layer made of a non-magnetic material that is mainly composed of Cr, a keeper layer made of an NiFe-type soft magnetic material, an intermediate layer made of a non-magnetic material that is mainly composed of Cr and a recording layer made of a magnetic material that is mainly composed of Co.

Magnetic recording medium and a magnetic recording device

There is provided a magnetic storage medium capable of recording information at high recording density and also regenerating the information with a high quality of signal (high S/N ), and in addition contributing to the elongation of a life span of the recorded information. The magnetic storage medium comprises a non-magnetic substrate, a plurality of magnetic recording layers of ferromagnetism formed on the non-magnetic substrate, and a dividing layer of antiferromagnetism for dividing said plurality of magnetic recording layers from one another through intervening between the magnetic recording layer-to-layer.

Magnetic storage medium

A non-magnetic substrate, a Cu layer having a film thickness ranging from 0.5 to 10 nm, a Cr layer having a film thickness of 100 nm or less, a magnetic layer made of CoCrPt alloy in which a percentage content of Cr ranges from 12 atoms % to 20 atoms % and a percentage content of Pt ranges from 4 atoms % to 18 atoms %, a protective layer and a lubricating layer are arranged in that order to form a magnetic recording medium. Because the Cu layer is sufficiently thinned, a medium noise is sufficiently reduced, and a medium S/N ratio is sufficiently heightened. Because the film thickness of the Cr layer is 100 nm or less, the medium noise is reduced. Because the composition of CoCrPt alloy is limited in the magnetic layer, the medium S/N ratio is heightened. In addition, it is preferred that another Cu layer having a film thickness ranging from 0.5 to 10 nm be inserted into the magnetic layer to divide the magnetic layer into two layers. In this case, the medium noise is reduced by 20%, and the medium S/N ratio is heightened. Therefore, even though a magnetoresistive effect type magnetic head is used to record or reproduce information in/from the magnetic recording medium, the medium noise is sufficiently reduced, and the medium R/N ratio is sufficiently heightened.

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Kawasaki, Japan

Hideyuki Akimoto