Postscript die information record media, information record manner, information recorder, information regenerative manner, production manner of information reproducing arrangement, and information record media

摘要

Record capacity around recording layer 1 formation augments, with the information record media where the size of SBM changes with the size of the spare field, DDS and SBM become mutual-dependence relation, information of disk management is difficult to acquire. With information record media of this invention, when size of the user data area is allocated most largely, although space bit map is stored, number of as for the necessary blocks it is_i N (_iN 2), when it allocates least, it becomes_i smaller than N. In this kind of information record media, although space bit map of a certain recording layer is stored, when number of the necessary blocks_i is designated as_ii M (1 M N), when_i M is 2 or more, space bit map, each one adjusting to DDS, being divided by the 1st - Mth space bit map which is the size which is settled_i in one block, is recorded to the block M_i of the disk management field.