Magnetic recording drive dynamics during seeking and parking

Author

Novotny, V.J.

Author_Institution

Seagate Technol., San Jose, CA, USA

Volume

33

Issue

5

fYear

1997

fDate

9/1/1997 12:00:00 AM

Firstpage

3115

Lastpage

3117

Abstract

A novel magnetic characterization technique has been developed to monitor head-disk spacings at high bandwidths during seeking, parking and during operational vibration and shock. This technique relies upon measurements of the magnetic amplitude of a constant frequency pattern written on every second track and on the readout of the graycode and servo bursts during seeking or parking. Magnetic data obtained during the crossing of thousands of magnetic tracks is analyzed with two subsequent envelope calculations. With well designed inductive and magnetoresistive head drives in normal seeking modes, head-disk spacing variations are within ±5 nm. Large head-disk spacing fluctuations are detected when using hard crash stops and parking at velocities in excess of 0.5 m/sec

Keywords

magnetic recording; constant frequency pattern; drive dynamics; envelope calculation; graycode; hard crash stop; head-disk spacing; inductive head; magnetic amplitude measurement; magnetic recording; magnetic track; magnetoresistive head; parking; seeking; servo burst; shock; vibration; Bandwidth; Electric shock; Fluctuations; Frequency measurement; Magnetic analysis; Magnetic heads; Magnetic recording; Magnetoresistance; Monitoring; Servomechanisms;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.617862

Filename

617862