Patent ID: 7027365

Claim:
A method of recording information as a pattern of marks and spaces on a recording track of a magneto-optical recording medium, said method comprising the steps of: a) writing a mark by having a sub-mark portion of a mark region of said magneto-optical recording medium magnetized in a first direction substantially perpendicular to the recording surface of said recording medium and by having an adjacent sub-space portion of said mark region magnetized in a second direction which opposes said first direction; b) setting the length (L 1 ) of said sub-mark portion of said mark region so as to be less than or equal to the length (L 2 ) of said adjacent sub-space portion of said mark region in the direction of said recording track; and c) setting a ratio of said length (L 2 ) of said sub-space portion to said length (L 1 ) of said sub-mark portion to an integer value less than or equal to 4 wherein the length of said mark region is determined on the basis of the following equation: b ≧( w+L 1 +exp)/2, wherein w denotes the spatial length of a copy window for copying said mark to a read-out layer by a domain expansion technique, L 1 denotes said length of said sub-mark portion, and exp denotes the time during which a bit from a recording layer can be nucleated and expanded into said read-out layer multiplied by the recording velocity.