Patent ID: 7463438

Claim:
An information storage apparatus that records servo information and user data on a recording face of a storage medium, the information storage apparatus comprising: a recording density measuring unit configured to measure an optimal recording density of a recording face corresponding to each head for a storage medium having no servo information recorded thereon; and a servo information writing unit configured to vary a recording density for each head such that the recording density reaches the optimal recording density measured by the recording density measuring unit, to thereby write the servo information onto the storage medium having no servo information recorded thereon, wherein the recording density measuring unit measures a respective optimal recording density for each of a plurality of zones obtained by radially dividing the recording face, for each of the zones of the recording face, the servo information writing unit writes the servo information varying the recording density for each head such that the recording density reaches the optimal recording density, the servo information writing unit writes the servo information onto the opposite recording faces of the storage medium such that positions of boundaries between zones in the radial direction having different recording densities are different from each other, and the information storage apparatus further comprises a seek control unit configured to switch the heads such that the zone boundary on the recording face having a target track is detoured during a seeking operation that moves the head to the position of the target track.