公开(公告)号：GB2347531A

公开(公告)日：2000-09-06

申请号：GB9927647

申请日：1999-11-24

Applicant: IBM

Inventor： YOKOE YUJI

IPC: G06F1/26 ,  G06F1/32 ,  G06F3/06 ,  G11B19/00 ,  H02J1/00

Abstract: A method of reducing energy dissipated by a device, such as a hard-disk drive, capable of making a transition between a first state, such as an active mode, and a second state, such as a power saving mode, the device dissipating less energy in its second state, comprises calculating the energy expected to be saved by the device when it makes a transition to its second state, determining the time the device should make the transition to the second state using the above calculation, and causing the device to transition to its second state. Both states may be power saving modes. The energy dissipated when the device makes a transition to the second state and then back to the first state may be compared with the energy dissipated when the device remains in a first state. A distribution of past command intervals may be calculated to calculate the energy expected to be saved. This may be used to calculate a response delay time with respect to the next command. The distribution of command intervals may be updated regularly.

公开(公告)号：DE69602486D1

公开(公告)日：1999-06-24

申请号：DE69602486

申请日：1996-03-26

Applicant: IBM

Inventor： NAKAMURA TAKASHI ,  YONEDA ISAO ,  YOKOE YUJI ,  TSUWAKO KAZUSHI ,  HARAKO FUJIO ,  SUDA KATSUMI ,  NAKAJIMA MICHIO ,  OGASAWARA KENJI

IPC: G11B5/60 ,  G11B19/04 ,  G11B19/20 ,  G11B23/50 ,  G11B21/21 ,  G11B27/36 ,  G11B5/48

Abstract: The present invention provides a disk drive apparatus which detects when a signal transducer head contacts a projection, forming a thermal asperity on the recording surfaces of disks, makes the flying height of the signal transducer head lower by changing the rotation speed from the normal rotation speed in read/write operations or by transforming a suspension having a bimetal structure while said signal transducer head is positioned over the detected projection on the track, and makes the signal transducer head strike against the projection to break the projection.

公开(公告)号：GB2347531B

公开(公告)日：2003-07-30

申请号：GB9927647

申请日：1999-11-24

Applicant: IBM

Inventor： YOKOE YUJI

IPC: G06F1/26 ,  G06F1/32 ,  G06F3/06 ,  G11B19/00 ,  H02J1/00

Abstract: A system which reduces power dissipation in a data storage device having a normal operating mode and at least one power saving mode by computing a predicted amount of power that would be saved by the device if the device makes a transition from the normal operating mode to the power saving mode; computing a time at which the device should transition from the normal operating mode to the power saving mode, based on at least one predicted amount of power to be saved; and transitioning the device from the normal operating mode to the power saving mode.

公开(公告)号：DE69602486T2

公开(公告)日：1999-12-09

申请号：DE69602486

申请日：1996-03-26

Applicant: IBM

Inventor： NAKAMURA TAKASHI ,  YONEDA ISAO ,  YOKOE YUJI ,  TSUWAKO KAZUSHI ,  HARAKO FUJIO ,  SUDA KATSUMI ,  NAKAJIMA MICHIO ,  OGASAWARA KENJI

IPC: G11B5/60 ,  G11B19/04 ,  G11B19/20 ,  G11B23/50 ,  G11B21/21 ,  G11B27/36 ,  G11B5/48

Abstract: The present invention provides a disk drive apparatus which detects when a signal transducer head contacts a projection, forming a thermal asperity on the recording surfaces of disks, makes the flying height of the signal transducer head lower by changing the rotation speed from the normal rotation speed in read/write operations or by transforming a suspension having a bimetal structure while said signal transducer head is positioned over the detected projection on the track, and makes the signal transducer head strike against the projection to break the projection.

公开(公告)号：SG46480A1

公开(公告)日：1998-02-20

申请号：SG1996004997

申请日：1994-12-16

Applicant: IBM

Inventor： NAKAMURA TAKASHI ,  MUMATA TSUTOMU ,  OGASAWARA KENJI ,  KIGAMI YUJI ,  KURACHI KOJI ,  OKADA MAYUMI ,  MATSUI TAKAO ,  YOKOE YUJI

IPC: G11B20/10 ,  G11B5/012 ,  G11B5/09 ,  G11B19/02 ,  G11B20/12 ,  G11B20/18 ,  G11B27/10

Abstract: A disk drive having embedded servo information accesses data without using sector identifier recorded in each sector. When a signal sector pulse signal (SP) at the end of a servo area is detected in a dead state during start up, a first data state for the start of a sector transits to a second data state for the litter region of the sector being divided in accordance with the capacity stored in a current sector's pointer register. At the beginning of the sector, the contents of a next sector's pointer register is stored in current sector's pointer register and the contents of a next sector's operation register is stored in a current sector's operation register. Upon completion of sector processing, the first data state is maintained when the next sector is contiguous. When a terminate instruction is stored in current sector's operation register, the process moves to dead state. When the servo area arrives, the process moves to idle state. Responsive to this state, the magnetic head is activated to enable read and write operation for sectors having no sector identifier on the disk.