EP0499278A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method for recording sector control information on magneto-optical disk
Assignee: Sony Corp
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Filing: 1992-02-14
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Granted: —
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Expires: 2012-02-14
Abstract
Abstract Disclosed is a method for recording and reproducing sector control information to and from a novel magneto-optical disk (31) to which the so-called erasure type data reproduction method or data-embossed type reproduction method applies. On the magneto-optical disk (31), sector control information is recorded onto a sector control information recording region (34) at a track recording density lower than that of a data recording region (33). When data is recorded on the disk (31) at a high track density, the sector control information is recorded in such a manner that the information will not exist on adjacent tracks (36) in the same rotating direction of the disk.
Inventors
- 👤 Yoshimura c/o SONY CORPORATION Shunji
- 👤 Udagawa c/o SONY CORPORATION Toshiki
- 👤 Fujumoto c/o SONY CORPORATION Atsushi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 17:11
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10502; G11B11/10515; G11B11/1055; G11B11/10576; G11B11/10578; G11B20/00; G11B20/10; G11B20/12; G11B20/1217; G11B7/00; G11B7/007; G11B7/00745; G11B2220/00; G11B2220/20; G11B2220/25; G11B2220/2525; G11B2220/2537
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
172 words
A method for recording sector control information on a magneto-optical disk (31) comprising a recording layer (11) containing data and a reproduction layer (14), said recording layer (11) being magnetically connected to said reproduction layer (14) in a steady state, said method comprising the steps of: irradiating a light beam (15) onto a region on the disk surface so as to raise the temperature above a predetermined temperature level within the beam spot (16) on said region and thereby to erase the magnetic connection between said recording layer (11) and said reproduction layer (14) under said beam spot (16); and reading data from said region excluding said beam spot (16) containing no magnetic connection following the erasure, said data being read from said recording layer (11) by way of said reproduction layer (14); wherein said sector control information is recorded in an embossed fashion onto said disk (31) prior to the recording of said data, said sector information being stored at a track (36) recording density lower than that of said data.
Claim 2
Dependent Claim
42 words
A method for recording sector control information onto a magneto-optical disk (31) according to claim 1, wherein the channel frequency of said sector control information is established by dividing the channel frequency of the recorded data by a factor of an integer.
Claim 3
Independent Claim
144 words
A method for recording sector control information onto a magneto-optical disk comprising a recording layer (11) containing data and a reproduction layer (14), said method comprising the steps of: orienting said reproduction layer (14) in one direction of magnetization; irradiating a light beam (15) onto a region on the disk surface so as to raise the temperature above a predetermined temperature level within the beam spot (16) on said region and thereby to transfer data from said recording layer (11) to said reproduction layer (14) under said beam spot (16); and reading the transferred data from the data-filled domain (33) of said reproduction layer (14); wherein said sector control information is recorded in an embossed fashion onto said disk (31) prior to the recording of said data, said sector information being stored at a track (36) recording density lower than that of said data.
Claim 4
Dependent Claim
41 words
A method for recording sector control information onto a magneto-optical disk according to claim 3, wherein the channel frequency of said sector control information is established by dividing the channel frequency of the recorded data by a factor of an integer.
Claim 5
Independent Claim
147 words
A method for recording sector control information onto a magneto-optical disk (31) comprising a recording layer (11) containing data and a reproduction layer (14), said method comprising the steps of: orienting said reproduction layer (14) in one direction of magnetization; irradiating a light beam (15) onto a region on the disk surface so as to raise the temperature above a predetermined temperature level within the beam spot (16) on said region and thereby to transfer data from said recording layer (11) to said reproduction layer (14) under said beam spot (16); and reading the transferred data from the data-filled domain (33) of said reproduction layer (14); wherein said sector control information is recorded in an embossed fashion between contiguous tracks (36) on said disk (31) in such a manner that none of said sector control information exists at locations having the same rotating direction of said disk.
Claim 6
Dependent Claim
39 words
A method for recording sector control information on a magneto-optical disk (31) according to claim 5, wherein said sector control information is recorded at intervals of a number of tracks (36), said number being an integer greater than two.
Claim 7
Dependent Claim
25 words
A method for recording sector control information on a magneto-optical disk according to claim 5, wherein said sector control information is recorded every other track.
Claim 8
Independent Claim
172 words
A method for recording sector control information on a magneto-optical disk (31) comprising a recording layer (11) containing data and a reproduction layer (14), said recording layer (11) being magnetically connected to said reproduction layer (14) in a steady state, said method comprising the steps of: irradiating a light beam (15) onto a region on the disk surface so as to raise the temperature above a predetermined temperature level within the beam spot (16) on said region and thereby to erase the magnetic connection between said recording layer (11) and said reproduction layer (14) under said beam spot (16); and reading data from said region excluding said beam spot (16) containing no magnetic connection following the erasure, said data being read from said recording layer (11) by way of said reproduction layer (14); wherein said sector control information is recorded onto said disk (31) prior to the recording of said data, said sector information being so stored as to be subsequently read in the same manner in which said data is reproduced.
Claim 9
Independent Claim
144 words
A method for recording sector control information onto a magneto-optical disk (31) comprising a recording layer (11) containing data and a reproduction layer (14), said method comprising the steps of: orienting said reproduction layer (14) in one direction of magnetization; irradiating a light beam (15) onto a region on the disk surface so as to raise the temperature above a predetermined temperature level within the beam spot (16) on said region and thereby to transfer data from said recording layer (11) to said reproduction layer (14) under said beam spot; and reading the transferred data from the data-filled domain (33) of said reproduction layer (14); wherein said sector control information is recorded onto said disk (31) prior to the recording of said data, said sector information being so stored as to be subsequently read in the same manner in which said data is reproduced.
References Cited (Backward Citations)
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