Position Error Signal Generation From User Data Track With a Multiple Reader Array in Shingled Magnetic Recording
Position Error Signal Generation From User Data Track With a Multiple Reader Array in Shingled Magnetic Recording
复制标题
叠瓦磁记录中使用多读取器阵列从用户数据磁道生成位置误差信号
DOI：
10.1109/tmag.2014.2319088
复制
发表时间：
2014
影响因子：
2.1
通讯作者：
Zhi
中科院分区：
文献类型：
--
作者：
M. Elidrissi;K. Chan;Zhi
当今的硬盘驱动器（HDD）系统具有跨越盘的旋转的嵌入式伺服楔，其在磁头飞越伺服楔时周期性地向磁头提供交叉轨迹位置信息。磁头受到诸如来自湍流、磁盘波动、冲击和振动的力，这些力导致其位置偏离其期望的在轨位置。伺服控制器的工作是使用位置误差信号（PES）中的信息来将磁头重新定位回到磁道上，该位置误差信号（PES）是在磁头飞越伺服楔形区时从读回信号计算的。目前的硬盘驱动器中嵌入式伺服系统存在着一些缺点。第一个是伺服楔形区的开销消耗了一些面密度，减少了用户数据的存储容量。今天，该开销在总磁盘表面的3%-5%的范围内。第二个缺点是，在伺服楔形区之间，伺服控制环没有位置信息，磁头是盲目飞行的。在本文中，我们提出了一种替代方法的伺服控制器，以获得PES，它需要定位在轨道上的头，而不需要伺服楔。我们的方法假设使用多个读取头，到今天为止，似乎是一个可能的升级到HDD系统的好处，由瓦状磁记录和2-D磁记录的承诺。
Hard disk drive (HDD) systems today have embedded servo wedges spanning the revolution of the disk that periodically provide the head with crosstrack position information as it flies over the servo wedges. The head is subjected to forces such as from turbulence, disk-waviness, shock, and vibration that cause its position to deviate from its desired on-track position. It is the job of the servo controller to use the information in the position error signal (PES), calculated from the readback signal as the head flies over the servo wedges, to reposition the head back on-track. There are a couple of disadvantages of the embedded servo system in today's HDDs. The first is that the overhead of the servo wedges consumes some of the areal density reducing the amount of storage capacity for the user's data. Today, that overhead is in the range of 3%-5% of the total disk surface. The second disadvantage is that between servo wedges, the servo control loop has no position information and the head is flying blind. In this paper, we propose an alternative method for the servo controller to obtain the PES it needs to position the head on-track without the need for servo wedges. Our method assumes the usage of a multiple-reader head that, as of today, seems to be a likely upgrade to HDD systems in view of the benefits promised by shingled magnetic recording and 2-D magnetic recording.