公开(公告)号：GB2389447B

公开(公告)日：2004-08-04

申请号：GB0317186

申请日：2001-12-24

Applicant: IBM

Inventor： SHIMIZU MASAHIRO ,  KITAZAKI NOBUYUKI

IPC: G11B19/04 ,  G11B21/08 ,  G11B21/10 ,  G11B21/12 ,  H01Q13/08

Abstract: A process, apparatus, and system are disclosed for inhibiting erroneous control signals due to disruptive electromagnetic signals. In one embodiment, the invention prevents erroneous information writing in a recording device under the effect of background electromagnetic waves. A conductor pattern is formed on a printed wiring board on which wiring constituting a control circuit of a hard disk drive is formed. Background electromagnetic waves are detected by an electromagnetic wave detection circuit. In the case where an electromagnetic wave signal detected by the electromagnetic wave detection circuit exceeds a predetermined power, voltage, or current threshold, a write gate signal is turned off to inhibit a potential write operation.

公开(公告)号：GB2389447A

公开(公告)日：2003-12-10

申请号：GB0317186

申请日：2001-12-24

Applicant: IBM

Inventor： SHIMIZU MASAHIRO ,  KITAZAKI NOBUYUKI

IPC: G11B19/04 ,  G11B21/08 ,  G11B21/10 ,  G11B21/12 ,  H01Q13/08

Abstract: Provided is a technology capable of inhibiting erroneous information writing in a recording device under the effect of background electromagnetic waves. A conductor pattern (7) is formed on a printed wiring board on which wiring constituting a control circuit of a hard disk drive is formed. Background electromagnetic waves are detected by an electromagnetic wave detection circuit (16). In the case where an electromagnetic wave signal level exceeds a predetermined threshold, a write gate signal is turned off to inhibit write operation.

公开(公告)号：JP2002208213A

公开(公告)日：2002-07-26

申请号：JP2001000124

申请日：2001-01-04

Applicant: IBM

Inventor： SHIMIZU MASAHIRO ,  KITAZAKI NOBUYUKI

IPC: G11B19/04 ,  G11B21/08 ,  G11B21/10 ,  G11B21/12 ,  H01Q13/08 ,  G11B19/00

Abstract: PROBLEM TO BE SOLVED: To provide a technique for preventing wrong information from being written due to an influence of electromagnetic waves in a rotary recording device. SOLUTION: A conductive pattern 7 is formed on a printed board on which the wiring composing a control circuit of a hard disk device is formed, and a signal from this conductive pattern 7 is detected by an electromagnetic wave detection circuit 16. When a signal level exceeds a prescribed threshold value, a write gate signal is switched off, and write processing is prohibited.

公开(公告)号：JP2002269938A

公开(公告)日：2002-09-20

申请号：JP2001055997

申请日：2001-02-28

Applicant: IBM

Inventor： KITAZAKI NOBUYUKI ,  OGASAWARA KENJI ,  SHIMIZU MASAHIRO

IPC: G11B21/08 ,  G11B5/55 ,  G11B21/10

Abstract: PROBLEM TO BE SOLVED: To enhance a servo tracking performance in a low frequency region without losing the stability of seek operations. SOLUTION: The position control system of the magnetic head is provided with two integrators; a 1st integrator 43 and a 2nd integrator 45. A gain K3' of the 2nd integrator 45 is set higher than a gain K3 of the 1st integrator 43. The 1st integrator 43 play a role of canceling a bias force acted on the magnetic head and the 2nd integrator 45 play a role of improving the servo tracking characteristic in the low frequency region.

公开(公告)号：JP2002182810A

公开(公告)日：2002-06-28

申请号：JP2000370626

申请日：2000-12-05

Applicant: IBM

Inventor： OSHIKAWA HIROSHI ,  SHIMIZU MASAHIRO ,  YAMADA MITSUHARU ,  OMORI TADASHI

IPC: G06F3/00 ,  G06F3/06 ,  G11C29/00

Abstract: PROBLEM TO BE SOLVED: To improve the reliability of data transfer by increasing timing margin without lowering data transfer speed. SOLUTION: The slew rate controller of a driver independently controls the slew rate of a data signal and the slew rate of a control signal of a strobe signal, etc., and the slew rate of the data signal is made smaller than the slew rate of the strobe signal. Namely, a waveform inclination in the transition time of the strobe signal is made larger than that of the data signal in a signal waveform.

公开(公告)号：JPH1116259A

公开(公告)日：1999-01-22

申请号：JP16729697

申请日：1997-06-24

Applicant: IBM

Inventor： UCHIIKE HIROSHI ,  OGASAWARA KENJI ,  AMANO YOSHIRO ,  SHIMIZU MASAHIRO ,  KURIHARA SHUSUKE ,  TSUCHIMOTO KAZUNARI ,  KITAZAKI NOBUYUKI ,  UENO SHINJI ,  YONEDA ISAO ,  YOKOE YUJI ,  SAI FUMINORI

IPC: G11B21/02 ,  G11B5/54 ,  G11B19/04 ,  G11B21/12

Abstract: PROBLEM TO BE SOLVED: To prevent a head slider from accidentally landing. SOLUTION: The head slider provided with a transducer head is mounted on a head arm of the head mechanism and loaded on a disk by the turning of the head arm and also unloaded to the retreating position out of the disk from on the disk. A shock sensor is provided for sensing the shock received by the head mechanism from the outside. The loading operation of the head slider is started at a step S2, and when the shock is sensed at a step S3 during the loading operation, the loading is stopped at a step S5 and the unloading is carried out at a step S6 to return the head slider to the retreating position. When the unloading operation at the step S6 is finished, the head slider is returned to the step S2 and the reloading is started.