公开(公告)号：US09070411B1

公开(公告)日：2015-06-30

申请号：US13935545

申请日：2013-07-04

Applicant: Seagate Technology LLC

Inventor： Timothy Ellis ,  Joshua W. Christensen ,  Ravi Hebbar ,  John Purkett ,  Justin Won

IPC: G11B5/09 ,  G11B20/14 ,  G11B5/596 ,  G11B20/12

CPC classification number: G11B5/59633 ,  G11B5/59627 ,  G11B5/59655 ,  G11B5/59661 ,  G11B20/10222 ,  G11B2020/1287

Abstract: Systems and methods are disclosed for writable servo zone overlap regions on a disc memory. An apparatus may comprise a controller configured to determine a servo gate (sgate) timing for an overlap zone including servo patterns of a first servo super zone and a second servo super zone of a disc memory, the sgate timing based on servo pattern timing for the first servo super zone and the second servo super zone. The controller may initiate writing to the overlap zone based on the sgate timing. The controller may also reduce the impact of servo pattern frequency change between zones by calculating a trajectory error prior to the crossing, and providing 1/X of the trajectory error into a servo feedback loop for a following X servo sampling points.

Abstract translation: 公开了用于盘存储器上的可写伺服区重叠区域的系统和方法。 装置可以包括：控制器，被配置为确定包括盘存储器的第一伺服超级区域和第二伺服超级区域的伺服模式的重叠区域的伺服门（sgate）定时，基于伺服模式定时 第一伺服超级区和第二伺服超区。 控制器可以基于sgate定时开始写入重叠区域。 控制器还可以通过计算交叉之前的轨迹误差来减小区域之间的伺服模式频率变化的影响，并且将轨迹误差的1 / X提供给用于后续X伺服采样点的伺服反馈回路。

公开(公告)号：US08922921B1

公开(公告)日：2014-12-30

申请号：US14071912

申请日：2013-11-05

Applicant: Seagate Technology LLC

Inventor： Ravi Hebbar ,  Russel Clemmons ,  Bruce D. Buch

IPC: G11B5/86

CPC classification number: G11B5/59627 ,  G11B5/59655

Abstract: A first portion of a track identifier is read from a first servo wedge of a track of a magnetic disk. A second portion of the track identifier is read from a second servo wedge of the track. The second portion includes least-significant bits of the track identifier that are also stored in the first portion. The first and second portions are combined to determine the track identifier for the first and second servo wedges, and the track is identified using the track identifier.

Abstract translation: 轨道标识符的第一部分从磁盘的轨道的第一伺服楔形件读取。 轨道标识符的第二部分从轨道的第二伺服楔形件读取。 第二部分包括也存储在第一部分中的轨道标识符的最低有效位。 组合第一和第二部分以确定第一和第二伺服楔形的轨道标识符，并且使用轨道标识符识别轨道。