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    Improvements in self-servowriting timing pattern generation
    12.
    发明专利
    Improvements in self-servowriting timing pattern generation 未知

    公开(公告)号：SG34300A1

    公开(公告)日：1996-12-06

    申请号：SG1995001806

    申请日：1995-11-10

    Applicant: IBM

    Inventor： CHAINER TIMOTHY JOSEPH ,  PRAINO ANTHONY PAUL ,  SCHULTZ MARK DELORMAN ,  WEBB BUCKNELL CHAPMAN ,  YARMCHUK EDWARD JOHN

    IPC: G11B5/55 ,  G11B5/596 ,  G11B19/04 ,  G11B21/10 ,  G11B5/58

    Abstract: Improvements in placement of timing patterns in self servo writing include correcting for random and systematic errors due to geometric effects. In a disk drive having a recording head with separate read and write elements, a method for determining separation between the elements and for correcting for such errors as a function of skew angle between the head and the disk. Errors resulting from misalignment and non-parallelism of the elements as well as misalignment of the head on it its actuator are also detected and corrected. Errors due to changes in rotational velocity of the disk and misplacement of timing patterns with respect to adjacent timing patterns are detected and corrected. In general, a single revolution process may be used to both write and detect random errors on each track and corrected on subsequent tracks.

    Cooling control system and method for a data centre
    15.
    发明专利
    Cooling control system and method for a data centre 未知

    公开(公告)号：GB2500966A

    公开(公告)日：2013-10-09

    申请号：GB201301549

    申请日：2013-01-29

    Applicant: IBM

    Inventor： PARIDA PRITISH RANJAN ,  CHAINER TIMOTHY JOSEPH ,  IYENGAR MADHUSUDAN ,  MILNES DAVID PAUL ,  SIMONS ROBERT

    IPC: G06F1/20 ,  F24F11/00 ,  F24F11/02 ,  G05D23/19 ,  H05K7/20

    Abstract: A cooling system such as an intra-rack cooling system 500 of a data centre comprises: one or more nodes, such as servers 300, each node having at least one temperature sensor to monitor a temperature of the node components; an air-to-liquid heat exchanger 402 configured to accept a liquid coolant input, preferably via a first shut-off valve 504, to provide cooled air to the one or more nodes; and a temperature sensor to monitor a temperature of air Tai provided by the heat exchanger. The cooling system also comprises a direct liquid cooling apparatus to provide liquid coolant to components of the one or more nodes, preferably an inlet plenum 404, i.e. manifold, and an outlet plenum 406. The apparatus supplies cold input coolant 412, preferably via a second shut-off valve 506, to the one or more nodes and ejects warm coolant 410. A valve, ideally a three-way valve 502, is configured to control a proportion of the coolant flow directed to the heat exchanger and the one or more nodes based upon the monitored temperatures. A flow rate of coolant is also controlled based upon the monitored temperatures, preferably by varying the pump strength of a pump 401.

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