Dynamic magnetic information storage or retrieval – Record medium – Disk
Patent
1993-01-04
1994-03-22
Robertson, David L.
Dynamic magnetic information storage or retrieval
Record medium
Disk
360 55, 360 7702, 360 7703, 427130, 427264, 427282, 235493, G11B 902, G11B 908, B05D 132, G06K 1906
Patent
active
052969959
ABSTRACT:
The present invention uses a magnetic recording medium equipped with those magnetically readable recording servo pits which are preformed on a magnetic recording medium and have different magnetic characteristics from those of a recording magnetic film, detects magnetically a tracking signal or preformat signals such as sync signals, address signals, and the like, from the magnetic flux distribution (leakage magnetic field) occurring at edges of each of the servo pits using a magnetic head, makes servo control of the position of the magnetic head by the detected tracking signal and records or reads magnetically the data along the center of a track. In the magnetic recording medium of the present invention, magnetically readable, wobbled servo pits or sync pits, track address pits and data pits are preformed on the magnetic recording medium, these pit portions have locally different magnetic characteristics from those of the recording magnetic film and have a magnetic film structure wherein saturated magnetization is smaller than at other portions or the magnetic film is removed locally. These preformed pits can be read magnetically by detecting the local magnetic field (leakage magnetic field) generated at their edges by the magnetic head.
REFERENCES:
patent: 3034111 (1962-05-01), Hoagland et al.
patent: 3593331 (1971-07-01), Connell et al.
patent: 3753252 (1973-08-01), Tietze
patent: 4188646 (1980-02-01), Sordello et al.
patent: 4746580 (1988-05-01), Bishop et al.
patent: 4912487 (1990-03-01), Porter et al.
patent: 4912585 (1990-03-01), Belser et al.
patent: 4935278 (1990-06-01), Krounbi et al.
patent: 4935835 (1990-06-01), Godwin et al.
patent: 4961123 (1990-10-01), Williams et al.
Fukke Hajime
Ito Masaru
Kataoka Keiji
Kato Keizo
Kinstatter Klaus
Hitachi , Ltd.
Robertson David L.
LandOfFree
Method of magnetically recording and reading data, magnetic reco does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of magnetically recording and reading data, magnetic reco, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of magnetically recording and reading data, magnetic reco will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-441188