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In an optical recording method and apparatus for an optical storage medium, a recording pulse pattern having a sequence of multiple pulses is used to record one of plural kinds of marks with different lengths on the storage medium through a variable-linear-velocity recording process or a constant-an

In an optical recording method and apparatus for an optical storage medium, a recording pulse pattern having a sequence of multiple pulses is used to record one of plural kinds of marks with different lengths on the storage medium through a variable-linear-velocity recording process or a constant-angular-velocity recording process. Two or more discrete write powers are individually allocated to the respective pulses of the recording pulse pattern. Each of the write powers, allocated to the respective pulses of the recording pulse pattern, is linearly varied in proportion with a change of one of the recording linear velocity and a recording position of the storage medium. The resulting recording pulse pattern is supplied to a pickup, and the pickup emits a light beam to the storage medium in accordance with the recording pulse pattern having the linearly varied write powers allocated to the respective pulses, so that one of the plural kinds of marks is recorded on the storage medium.

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In an optical recording method and apparatus for an optical storage medium, a recording pulse pattern having a sequence of multiple pulses is used to record one of plural kinds of marks with different lengths on the storage medium through a variable-linear-velocity recording process or a constant-an

In an optical recording method and apparatus for an optical storage medium, a recording pulse pattern having a sequence of multiple pulses is used to record one of plural kinds of marks with different lengths on the storage medium through a variable-linear-velocity recording process or a constant-angular-velocity recording process. Two or more discrete write powers are individually allocated to the respective pulses of the recording pulse pattern. Each of the write powers, allocated to the respective pulses of the recording pulse pattern, is linearly varied in proportion with a change of one of the recording linear velocity and a recording position of the storage medium. The resulting recording pulse pattern is supplied to a pickup, and the pickup emits a light beam to the storage medium in accordance with the recording pulse pattern having the linearly varied write powers allocated to the respective pulses, so that one of the plural kinds of marks is recorded on the storage medium. ing to claim 1, wherein the shielding element is formed of a plate metal of a conductive material, a portion of which is bent to integrally form the shield convex. 4. The cartridge according to claim 1, wherein the opening and the shield convex are formed near a leading end of the cartridge with respect to a direction of inserting the cartridge into the recess, such that the opening and the shield convex extend along a direction perpendicular to the insertion direction. 5. The cartridge according to claim 1, wherein the housing includes at least one positioning member on the inside of at least one of the upper and lower halves, the at least one positioning member being for positioning the substrate and the shielding element. 6. The cartridge according to claim 1, wherein the cartridge further comprises: a further shielding element being accommodated on the inside of another principal face of the housing so as to face the substrate, wherein the shielding element and the further shielding element are electrically connected to each other within the housing. 7. The cartridge according to claim 1, wherein the open end face of the housing is dimensioned so that the housing has a width which is substantially the same as a width of the substrate and that the housing has a thickness which is greater than a thickness of the substrate, and the cartridge further comprises a spacer, the spacer being accommodated within the housing to enclose the open end face where the open end face has a thickness greater than the thickness of the substrate. . 17. Data compression apparatus for compressing an input stream of data characters into an output stream of compressed codes, said data characters being from an alphabet of data characters, comprising a plurality of prefix tables for storing strings of data characters encountered in said input stream, said stored strings having respective codes associated therewith, a string comprising a prefix string of at least one of said characters followed by an extension character, each said prefix string having a code associated therewith, said plurality of prefix tables corresponding to respective prefix codes, a particular string being stored in said prefix tables by storing the code associated with said particular string in the prefix table corresponding to the code of the prefix string of said particular string at a prefix table location corresponding to the extension character of said particular string, means for searching said input stream by comparing said input stream to said stored strings to determine the longest match therewith, means for outputting the code associated with said longest match so as to provide said output stream of compressed codes, and means for inserting an extended string into said prefix tables, said extended string comprising said longest match extended by the next data character in said input stream following said longest match, said extended string being stored in the prefix table corresponding to said code of said longest match. 18. The compression apparatus of claim 17 wherein said searching means comprises means operative for (a) matching one of said stored strings thereby providing a current match, (b) fetching the next data character from said input stream following said current match thereby providing a current character, (c) determining if the location corresponding to said current character in a prefix table corresponding to said current match is empty, and (d) if said location is not empty, setting said current match to the string code stored in said location and repeating steps (b) through (d) until the location of step (c) is determined to be empty, thereby determining said longest match. 19. The compression apparatus of claim 18 wherein said outputting means comprises means for outputting said current match. 20. The compression apparatus of claim 18 where