Patent ID: 6999395

Claim:
An information storage medium comprising: a management area that stores management information; and a data area that stores predetermined data in predetermined recording units, wherein the predetermined data is modulated according to a (d, k; m, n) modulation rule, the (d, k; m, n) modulation rule modulates m-bit source data into n-channel bit data, so that modulated channel bit patterns satisfy conditions that a minimum d pieces of 0s successively arranged and a maximum of k pieces of 0s successively arranged, the predetermined data includes a plurality of SYNC codes in the predetermined recording unit, the number of 1s included in a predetermined number of a series of channel bits at an arbitrary position in the SYNC code is not more than a half the predetermined number, each of the plurality of SYNC codes includes a fixed code and a variable code, wherein the fixed code includes k or more sequences of 0s successively arranged and d+1 sequences of 0s successively arranged, wherein the variable code is one of a first pattern, a second pattern and a pattern other than the first pattern and second pattern, and combinations of the variable codes of three successive SYNC codes in the predetermined recording unit are different from one another.