Media design considerations for a PRML channel

Author

Palmer, Dean C. ; Coker, Jonathan D.

Author_Institution

IBM Corp., Rochester, MN, USA

Volume

29

Issue

1

fYear

1993

fDate

1/1/1993 12:00:00 AM

Firstpage

189

Lastpage

194

Abstract

The requirements placed on the recording media by the partial-response maximum-likelihood (PRML) detection channel are examined in order to obtain optimum readback performance. It is noted that the use of a partial response (PR) data channel leads to somewhat different requirements for the recording media than are found for a conventional peak detector channel. The high transition density of current PR codes changes both the nonlinear behavior and the noise level in thin film media. Consequences of the different equalization techniques and sensor types have been explored. A by-product of the amplitude-sampling PR channel is a range of useful recording test functions which can be built into the channel and which can be used in a self-diagnostic mode

Keywords

magnetic disc storage; magnetic recording; magnetic thin films; maximum likelihood estimation; equalization techniques; high transition density; media design considerations; noise level; nonlinear behavior; optimum readback performance; partial response maximum-likelihood channel; recording test functions; self-diagnostic mode; sensor types; thin film media; Bandwidth; Bit error rate; Demagnetization; Detectors; Distortion measurement; Noise level; Nonlinear distortion; Pulse measurements; Sampling methods; Transistors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.195568

Filename

195568