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No Clock Head Servo Write Process with Side by Side Read Write Elements

IP.com Disclosure Number: IPCOM000013332D
Original Publication Date: 2000-Feb-01
Included in the Prior Art Database: 2003-Jun-18
Document File: 1 page(s) / 58K

Publishing Venue

IBM

Abstract

During the servowrite process, the read element must be able to read a

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No Clock Head Servo Write Process with Side by Side Read Write Elements

   During the servowrite process, the read element must be able to read a
previously written track to obtain timing and pattern information. This is a
problem for read write elements where the track spacing is greater than one
track. Propagation cannot be started.

In modern disk drives the read head consists of a magneto resistive element and
the write head is usually Inductive. Alignment of the two elements is defined by
design and manufacturing tolerances. Side-by-side head design allows for very
close read write element tolerances but element spacing can be many tracks.

In the proposed method, an initial 1st track can be written against the crash
stop. The actuator can then be moved to position the read element under the 1st
written track and another servo track written equal to the R/W separation. The
actuator then moves to the plus and minus half track position and writes the two
more tracks. The actuator then moves to position the read element under the three
new tracks. The process then repeats adding 2 additional half tracks for each
step. The process continues to repeat until the number of written tracks equals
the read/write element spacing. Once the number of written tracks equals the
read/write separation, then the servo write timing or pattern generation can be
continuous in half track intervals.

Read Element Write Element

Track or Timing Propagation is done by using previously written track infor...