公开(公告)号：EP0166461A3

公开(公告)日：1987-05-20

申请号：EP85108976

申请日：1982-11-30

Applicant: NORTHERN TELECOM INC.

Inventor： Oliver, Theodore A. ,  Nelson, David L. ,  Chan, Keat-Lye

IPC: G11B20/10 ,  G11B05/09 ,  G11B05/596 ,  G11B21/10

CPC classification number: G11B5/5965 ,  G11B5/012 ,  G11B5/59616

Abstract: A method for writing a clock track on a magnetic storage medium of a disc system comprising a fixed read/write head, at least one moving read/write head, and means for translating the magnetic storage medium relative to the fixed and the moving heads, whereby information may be written on the medium in the form of magnetic transitions and the magnetic transitions may be read with the fixed and the moving heads, includes the steps of writing a single pair of transitions with the fixed heads, selecting a predetermined number N of transition pairs for a clock track, reading the single pair of transitions to create a single initial electrical pulse, phase-lock looping the initial electrical pulse to a number of electrical pulse to a number of electrical pulses approximately equal to the square root of N, writing an intermediate clock track with the moving head, the intermediate clock track having a number of transition pairs equal to the square root of N, reading the intermediate clock track to create a number of intermediate clock electrical pulses equal to the square root of N, phase-lock looping the intermediate clock electrical pulses to a number of electrical pulses equal to N and writing a clock track with the fixed head having N transition pairs.

公开(公告)号：EP0166461A2

公开(公告)日：1986-01-02

申请号：EP85108976.3

申请日：1982-11-30

Applicant: NORTHERN TELECOM INC.

Inventor： Oliver, Theodore A. ,  Nelson, David L. ,  Chan, Keat-Lye

IPC: G11B20/10 ,  G11B5/09

CPC classification number: G11B5/5965 ,  G11B5/012 ,  G11B5/59616

Abstract: A method for writing a clock track on a magnetic storage medium of a disc system comprising a fixed read/write head, at least one moving read/write head, and means for translating the magnetic storage medium relative to the fixed and the moving heads, whereby information may be written on the medium in the form of magnetic transitions and the magnetic transitions may be read with the fixed and the moving heads, includes the steps of writing a single pair of transitions with the fixed heads, selecting a predetermined number N of transition pairs for a clock track, reading the single pair of transitions to create a single initial electrical pulse, phase-lock looping the initial electrical pulse to a number of electrical pulse to a number of electrical pulses approximately equal to the square root of N, writing an intermediate clock track with the moving head, the intermediate clock track having a number of transition pairs equal to the square root of N, reading the intermediate clock track to create a number of intermediate clock electrical pulses equal to the square root of N, phase-lock looping the intermediate clock electrical pulses to a number of electrical pulses equal to N and writing a clock track with the fixed head having N transition pairs.

Abstract translation: 一种用于在包括固定读/写磁头，至少一个移动读/写磁头以及用于相对于固定磁头和移动磁头转换磁存储介质的装置的盘系统的磁存储介质上写入时钟轨迹的方法， 由此信息可以以磁转换的形式写在介质上，并且可以用固定磁头和移动磁头读取磁转变，包括以下步骤：将固定磁头写入一对转换，选择预定数量的N 用于时钟轨道的转换对，读取单个转换对以创建单个初始电脉冲，将初始电脉冲循环到多个电脉冲到大致等于N的平方根的多个电脉冲的数量， 用移动头写入中间时钟轨道，中间时钟轨道具有等于N的平方根的多个转换对，读取中间时钟 ck创建等于N的平方根的多个中间时钟电脉冲，将中间时钟电脉冲循环到等于N的多个电脉冲，并用具有N个转换对的固定头写入时钟轨道。

公开(公告)号：EP0084709B1

公开(公告)日：1987-02-11

申请号：EP82306357.3

申请日：1982-11-30

Applicant: NORTHERN TELECOM INC.

Inventor： Oliver, Theodore A. ,  Nelson, David L. ,  Chan, Keat-Lye

IPC: G11B5/58 ,  G11B21/10 ,  G11B5/012

CPC classification number: G11B5/5965 ,  G11B5/012 ,  G11B5/59616

公开(公告)号：EP0084709A1

公开(公告)日：1983-08-03

申请号：EP82306357.3

申请日：1982-11-30

Applicant: NORTHERN TELECOM INC.

Inventor： Oliver, Theodore A. ,  Nelson, David L. ,  Chan, Keat-Lye

IPC: G11B5/58 ,  G11B21/10 ,  G11B5/012

CPC classification number: G11B5/5965 ,  G11B5/012 ,  G11B5/59616

Abstract: The system includes positioning means energizable for moving the read/write head to preselected recording positions relative to the disc and drive means for creating relative movement between the disc and the read/write head thereby enabling the transfer of data between the storage medium and the head. A plurality of servo tracks are embedded or recorded in servo data sectors on the disc for identifying preselected radial positions or informational data tracks on the disc. The servo data tracks are provided with a nonuniform radial track density. The track density of the servo tracks varies from more dense at the periphery of the disc to less dense at the interior of the disc. The radial track density of the servo data tracks is established with a method of writing embedded servo data that allows the unique performance characteristics of the moving read/ write head to determine the actual spacing of the tracks. A clock track is written by writing a single pulse on a fixed clock track head, phase-lock looping to an intermediate clock track, which is written on a moving read/write head, and then phase-lock looping up to the final clock track which is written on the fixed clock track head. Radial track density is then determined by moving one of the read/write heads to a limit stop and writing a reference track.

Abstract translation: 该系统包括能够将读/写头移动到相对于盘的预选记录位置的定位装置和用于在盘和读/写头之间产生相对移动的驱动装置，从而使得能够在存储介质和头之间传送数据 。 多个伺服磁道被嵌入或记录在盘上的伺服数据扇区中，用于识别盘上预选的径向位置或信息数据轨道。 伺服数据轨道具有不均匀的径向轨道密度。 伺服轨道的轨道密度从盘的周边处的密度更高，在盘的内部变为较不致密。 使用写入嵌入式伺服数据的方法来建立伺服数据磁道的径向磁道密度，这允许移动读/写磁头的独特性能特性确定磁道的实际间距。 通过在固定时钟轨道头上写入单个脉冲，将相位锁定循环到写入移动读/写头的中间时钟轨道，然后锁相环到最终时钟轨迹来写入时钟轨道 它写在固定时钟轨道头上。 然后通过将读/写头中的一个移动到限位停止并写入参考轨道来确定径向轨道密度。