Browse Prior Art Database

Servo Write Method using Magnetro Optical Clock Head

IP.com Disclosure Number: IPCOM000113735D
Original Publication Date: 1994-Sep-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Nakao, K: AUTHOR [+3]

Abstract

Disclosed is using Magnetro Optical head (MO) for clock head at servo track writing of Hard Disk Drive. In the current servo writing system, a clock head of the servo writer writes clock paterns, and then data head of HDD writes the synchronous signal. This invention shows that using a MO head instead of magnetic head makes servo performance fairly well and cost reduction.

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Servo Write Method using Magnetro Optical Clock Head

      Disclosed is using Magnetro Optical head (MO) for clock head at
servo track writing of Hard Disk Drive.  In the current servo writing
system, a clock head of the servo writer writes clock paterns, and
then data head of HDD writes the synchronous signal.  This invention
shows that using a MO head instead of magnetic head makes servo
performance fairly well and cost reduction.

      Acutually, data head and clock head have skew angle between
them.  That skew cause servo patern accuracy being worse (Fig. 1).
But if those heads were closer, it would happen to be magnetic
interference (Fig. 2).

      That's why using MO head for the clock head makes it possible
to write servo paterns on an ideal position without any magnetical
interference (Fig. 3).

      And also, by using particle hole for MO clock head writing,
seal for the clock write area to be eliminated (cost reduction).