公开(公告)号：US07576941B1

公开(公告)日：2009-08-18

申请号：US11924830

申请日：2007-10-26

申请人： Teddy T. C. Chen ,  Eugene Chun-Tsing Wu ,  John Yin Kwong Li ,  Jie Yu ,  Jonathan V. Nguyen ,  Tuong M. Vu ,  Guoxiao Guo

发明人： Teddy T. C. Chen ,  Eugene Chun-Tsing Wu ,  John Yin Kwong Li ,  Jie Yu ,  Jonathan V. Nguyen ,  Tuong M. Vu ,  Guoxiao Guo

IPC分类号： G11B5/596

CPC分类号： G11B5/59627

摘要： A disk drive is disclosed comprising a plurality of servo sectors that define a plurality of tracks, and a head comprising a read element radially offset from a write element. The read element is positioned over a first track, and the first track is read to generate first read wedge repeatable runout (WRRO) values. A first seek operation of the head positions the read element over a second track, and the second track is read to generate first write WRRO values. The first write WRRO values are used to write the first read WRRO values to the first track. A second seek operation of the head positions the read element over a third track, and the third track is read to generate second write WRRO values. The second write WRRO values are used to write the first write WRRO values to the second track.

摘要翻译： 公开了一种磁盘驱动器，其包括限定多个磁道的多个伺服扇区，以及包括从写入元件径向偏移的读取元件的磁头。 读取元件位于第一轨道上，并且读取第一轨迹以产生第一读取楔形可重复跳动（WRRO）值。 头部的第一寻找操作将读取的元素定位在第二个轨道上，并且读取第二个轨迹以产生第一个写入WRRO值。 第一次写入WRRO值用于将第一个读取的WRRO值写入第一个轨道。 磁头的第二次搜索操作将读取元件定位在第三磁道上，并且读取第三磁道以产生第二写WRRO值。 第二次写入WRRO值用于将第一个写WRRO值写入第二个轨道。

公开(公告)号：US5172280A

公开(公告)日：1992-12-15

申请号：US428501

申请日：1989-10-26

申请人： John J. Quintus ,  Michael S. Sheehan ,  Tuong M. Vu

发明人： John J. Quintus ,  Michael S. Sheehan ,  Tuong M. Vu

IPC分类号： G11B5/008 ,  G11B5/035 ,  G11B5/09

CPC分类号： G11B5/035 ,  G11B5/00817 ,  G11B5/09

摘要： An apparatus and a method for calibrating the write current applied to a write head (110, 114) in a tape drive (100) finds the peak value of the write current applied to the tape head (110, 114) (i.e., the write current value providing the maximum read voltage amplitude on a tape (104)) by indirectly measuring the voltage sensed by a read head (112, 115). The apparatus includes a digital write current control circuit (170, 160) that applies a write current having a magnitude responsive to a digital write current value. An amplifier (190) in a read circuit (180, 182, 184, 190, 196) has a gain responsive to a digital read gain value. The method includes the steps of sampling the output of a pattern detector (146) (e.g., a gap detector) as the digital read gain value is adjusted for each of a number of digital write current data values applied to the write current control circuit (170, 160). The digital read gain value is adjusted to provide a predetermined range of the number of samples wherein the pattern corresponds to a predetermined pattern. The digital read gain value for each digital write current value is inversely related to the amplitude of the signal recorded on the tape (104). The sampled digital read voltage gain values are then stored. The digital write current value corresponding to the minimum stored digital read gain value also corresponds to the peak value of the actual write current. The digital write current value corresponding to the minimum digital read voltage gain value is then selected and stored as the calibrated digital write current.