| 摘要 |
In a disc drive device ( 10 ) described as a specific embodiment of the present invention, AC 0 to AC 14 of ADIP cluster address are associated with address bits AU 6 to AU 20 of an address unit. On the basis of 8-bit sector address on the lower side of cluster address arranged in ADIP address of a conventional MD, 0/1 representing sector address FC to 0 D of a former-half cluster and sector address 0 E to 1 F of a latter-half cluster of a sector of a next-generation MD( 1 ) is associated with address bit AU 5 of the address unit. To a part ( 110 ) of 4 address bits AU 4 to AU 1 below this, 4 bits representing individual parts obtained by equally dividing one recording block by 16 are allocated. Thus, a higher-density data volume can be handled without causing any inconvenience while utilizing an existing recording format.
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