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Read Gate Timing for a Head with Large Read Write Separation

IP.com Disclosure Number: IPCOM000123653D
Original Publication Date: 1999-Feb-01
Included in the Prior Art Database: 2005-Apr-05
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Kisaka, M: AUTHOR [+3]

Abstract

The method for setting timing for a read gate and a write gate of a hard disk drive (HDD) is disclosed. The HDD stores data in sectors. A format of the sector is shown in Fig. 1. Read back signal at beginning of the sector is shown in Fig. 2. To write the data, a read element detects a servo start mark (SSM), and the data is written by a write element after T1 time from SSM. T1 is determined so that the write operation does not overwrite a pad for servo data. As in Fig. 2, when the write operation starts, the read element passes the starting point of the write operation because of read/write separation of an MR (magnetoresistive) head. Therefore if the read gate is activated after T1 from the SSM, the data before T1 can not be used.

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Read Gate Timing for a Head with Large Read Write Separation

   The method for setting timing for a read gate and a write
gate of a hard disk drive (HDD) is disclosed.  The HDD stores data
in sectors.  A format of the sector is shown in Fig. 1.  Read back
signal at beginning of the sector is shown in Fig. 2.  To write the
data, a read element detects a servo start mark (SSM), and the data
is written by a write element after T1 time from SSM.  T1 is
determined so that the write operation does not overwrite a pad for
servo data.  As in Fig. 2, when the write operation starts, the read
element passes the starting point of the write operation because of
read/write separation of an MR (magnetoresistive) head.  Therefore if
the read gate is activated after T1 from the SSM, the data before T1
can not be used.

   The proposed method enables to open the read gate
at T2 which is faster than T1 (Fig. 3).  By opening the gate at T2,
the data before T1 can be used, and more data can be stored in one
revolution.