公开(公告)号：US07852583B2

公开(公告)日：2010-12-14

申请号：US12012340

申请日：2008-01-31

申请人： Yoshiaki Uji ,  Minoru Shimada ,  Ryoh Miura ,  Takahiro Watanabe ,  Toyomi Ohsawa ,  Noriaki Satoh

发明人： Yoshiaki Uji ,  Minoru Shimada ,  Ryoh Miura ,  Takahiro Watanabe ,  Toyomi Ohsawa ,  Noriaki Satoh

IPC分类号： G11B27/36

CPC分类号： G11B5/6029 ,  G11B5/3133 ,  G11B5/607

摘要： Embodiments of the present invention allow for a precise altitude to be calculated from read-out signals of a head slider. In one embodiment, a hard disk controller/multiprocessing unit (HDC/MPU) determines a head element portion in which the instability has occurred in accordance with the resolution change. The HDC/MPU adjusts the clearance accordingly. The head element portion reads signals of different frequencies under a condition of the signal strengths coinciding with a reference value, and the HDC/MPU calculates the resolution. The HDC/MPU determines that the instability has occurred if the difference is outside the criterion. The HDC/MPU uses the read-out signal of a head slider in which the instability has not occurred to calculate the altitude.

摘要翻译： 本发明的实施例允许根据磁头滑块的读出信号计算精确的高度。 在一个实施例中，硬盘控制器/多处理单元（HDC / MPU）根据分辨率变化确定其中发生不稳定性的头元件部分。 HDC / MPU相应地调整间隙。 头元件部分在信号强度与参考值一致的条件下读取不同频率的信号，并且HDC / MPU计算分辨率。 如果差异超出标准，则HDC / MPU确定发生不稳定。 HDC / MPU使用未出现不稳定性的磁头滑块的读出信号来计算高度。

公开(公告)号：US20080212226A1

公开(公告)日：2008-09-04

申请号：US12012340

申请日：2008-01-31

申请人： Yoshiaki Uji ,  Minoru Shimada ,  Ryoh Miura ,  Takahiro Watanabe ,  Toyomi Ohsawa ,  Noriaki Satoh

发明人： Yoshiaki Uji ,  Minoru Shimada ,  Ryoh Miura ,  Takahiro Watanabe ,  Toyomi Ohsawa ,  Noriaki Satoh

IPC分类号： G11B5/54

CPC分类号： G11B5/6029 ,  G11B5/3133 ,  G11B5/607

摘要： Embodiments of the present invention allow for a precise altitude to be calculated from read-out signals of a head slider. In one embodiment, a hard disk controller/multiprocessing unit (HDC/MPU) determines a head element portion in which the instability has occurred in accordance with the resolution change. The HDC/MPU adjusts the clearance accordingly. The head element portion reads signals of different frequencies under a condition of the signal strengths coinciding with a reference value, and the HDC/MPU calculates the resolution. The HDC/MPU determines that the instability has occurred if the difference is outside the criterion. The HDC/MPU uses the read-out signal of a head slider in which the instability has not occurred to calculate the altitude.

摘要翻译： 本发明的实施例允许根据磁头滑块的读出信号计算精确的高度。 在一个实施例中，硬盘控制器/多处理单元（HDC / MPU）根据分辨率变化确定其中发生不稳定性的头元件部分。 HDC / MPU相应地调整间隙。 头元件部分在信号强度与参考值一致的条件下读取不同频率的信号，并且HDC / MPU计算分辨率。 如果差异超出标准，则HDC / MPU确定发生不稳定。 HDC / MPU使用未出现不稳定性的磁头滑块的读出信号来计算高度。

公开(公告)号：US07636217B2

公开(公告)日：2009-12-22

申请号：US11900708

申请日：2007-09-12

申请人： Yoshiaki Uji ,  Fujio Harako ,  Minoru Shimada ,  Ryoh Miura

发明人： Yoshiaki Uji ,  Fujio Harako ,  Minoru Shimada ,  Ryoh Miura

IPC分类号： G11B5/09

CPC分类号： G01M99/002 ,  G01R33/1207

摘要： Embodiments of the present invention efficiently conduct a test for detecting defects on a magnetic disk more accurately. According to one embodiment, a HDD carries out defect inspection of a magnetic disk using thermal fly height control (TFC). Changing a clearance by the TFC achieves defect inspection tests under varied test conditions without much decrease of throughput in manufacturing HDDs. First, a self analysis test (SAT) is carried out in a state that a heater power of P2 is supplied to a heater. Then, another SAT is carried out in a state that a heater power of P1 is supplied to the heater. The heater power P2 is larger than the heater power P1.

摘要翻译： 本发明的实施例更有效地进行用于检测磁盘上的缺陷的测试。 根据一个实施例，HDD使用热飞跃高度控制（TFC）执行磁盘的缺陷检查。 通过TFC改变间隙，在不同的测试条件下实现缺陷检测测试，而不会大大降低制造HDD的吞吐量。 首先，在将加热器功率P2提供给加热器的状态下进行自我分析测试（SAT）。 然后，在将加热器功率P1提供给加热器的状态下进行另一SAT。 加热器功率P2大于加热器功率P1。

公开(公告)号：US20080072692A1

公开(公告)日：2008-03-27

申请号：US11900708

申请日：2007-09-12

申请人： Yoshiaki Uji ,  Fujio Harako ,  Minoru Shimada ,  Ryoh Miura

发明人： Yoshiaki Uji ,  Fujio Harako ,  Minoru Shimada ,  Ryoh Miura

IPC分类号： G01M19/00

CPC分类号： G01M99/002 ,  G01R33/1207

摘要： Embodiments of the present invention efficiently conduct a test for detecting defects on a magnetic disk more accurately. According to one embodiment, a HDD carries out defect inspection of a magnetic disk using thermal fly height control (TFC). Changing a clearance by the TFC achieves defect inspection tests under varied test conditions without much decrease of throughput in manufacturing HDDs. First, a self analysis test (SAT) is carried out in a state that a heater power of P2 is supplied to a heater. Then, another SAT is carried out in a state that a heater power of P1 is supplied to the heater. The heater power P2 is larger than the heater power P1.

摘要翻译： 本发明的实施例更有效地进行用于检测磁盘上的缺陷的测试。 根据一个实施例，HDD使用热飞跃高度控制（TFC）执行磁盘的缺陷检查。 通过TFC改变间隙，在不同的测试条件下实现缺陷检测测试，而不会大大降低制造HDD的吞吐量。 首先，在将加热器功率P 2提供给加热器的状态下进行自我分析测试（SAT）。 然后，在将加热器功率P 1提供给加热器的状态下进行另一SAT。 加热器功率P 2大于加热器功率P 1。