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US 7,385,883 B2Granted
Stray field equalization for improved domain expansion reading
AssigneeKoninklijke Philips Electronics N.V.
InventorCoen Adrianus Verschuren
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AssigneeKoninklijke Philips Electronics N.V.
InventorCoen Adrianus Verschuren
Estimating the term…
In a magneto-optical recording technique by which an improved domain expansion reading is achieved, a mark region is recorded as a sub-mark portion and an adjacent sub-space portion, wherein the sum of predetermined first and second lengths of the sub-mark and sub-space portions, respectively, is changed in dependence on the pattern of marks and spaces. The write strategy enables writing a long run length with sub-mark and/or sub-space lengths selected independent of the channel bit length, such that a long run length can be written with few well-chosen domains with a stray field larger than the minimum field for MAMMOS readout. In this way, differences in readout conditions for all combinations of short and long run lengths can be eliminated, resulting in substantially improved power margins for random data.
A method of recoverably recording information as a pattern of marks and spaces on a recording track of a magneto-optical recording medium, said method comprising the acts of:
A recording apparatus for recoverably recording an information as a pattern of marks and spaces on a recording track of a magneto-optical recording medium, said apparatus comprising:
A magneto-optical recording medium on which an information is recoverably recorded on a recording track as a pattern of marks and spaces, wherein a mark region comprises at least one sub-mark portion of a first predetermined length magnetized in a first direction substantially perpendicular to the recording surface of said recording medium and at least one adjacent sub-space portion of a second predetermined length magnetized in a second direction opposite to said first direction, and wherein the sum of said predetermined first and second lengths is selected along said recording track in dependence on said pattern of marks and spaces.
Dependencies are inferred from the claim text.