Patent ID: 7426609

Claim:
A disk control apparatus for performing input/output control of data of a storage disk device according to an input/output request from a host, comprising: a cache memory which stores a part of the data of said storage disk device; a management table which has format information for indicating whether a track of said storage disk device has been initialized to a predetermined track format for each track of said storage disk device, said predetermined track format including at least a track position and an attribute of user area of the track; and a control unit which creates track format information of said predetermined track format referring to said management table when an input/output request is received from said host, wherein said control unit, when a write request is received from said host, stores write data into said cache memory, judges whether a target track for said write data has been initialized to said predetermined track format by referring to said management table, writes directly said write data and said track format information on said target track itself, where there is not written any track format, of said storage disk device when judging that the target track has not been initialized, and updates said format information of said target track in said management table to complete initialization of said target track.