High density recording for magneto-optical disk drive

Author

Nakamura, Shigeru ; Maeda, Takeshi ; Sugiyama, Hisataka ; Saga, Hideki ; Sukeda, Hirofumi ; Sugiyama, Toshinori

Author_Institution

Multimedia Syst. R&D Div., Hitachi Ltd., Yokohama, Japan

Volume

34

Issue

2

fYear

1998

fDate

3/1/1998 12:00:00 AM

Firstpage

411

Lastpage

413

Abstract

To obtain key technique for 1.9 Gbit/in² magneto-optical recording, a new wide groove recording structure and a new edge shift detection method are investigated. Track pitch of 0.85 μm is accomplished by the wide groove recording structure. The structure improves signal-to-noise ratio up to +6.5 dB. Recording and playback conditions are precisely controlled with the use of the new edge shift detection method. The detection method separately detects mark edge shifts and inter-symbol interferences by analyzing edge shifts in playback signal. Maximum edge shift of 3% to (1,7) detecting window at bit pitch of 0.40 μm is achieved

Keywords

intersymbol interference; magnetic recording noise; magneto-optical recording; edge shift detection; high density recording; inter-symbol interference; magneto-optical disk drive; playback signal; signal-to-noise ratio; track pitch; wide groove recording structure; Disk drives; Disk recording; Etching; Land surface; Laser beams; Magnetooptic recording; Optical surface waves; Rough surfaces; Signal to noise ratio; Surface roughness;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.667778

Filename

667778