Seek control method for a disk device used for reading/writing data from and to a disk recording medium

A method for performing a seek control operation for a disk device of the type having a pickup for reading/writing data from and to a disk, said method comprising the steps of:

• (a) moving the pickup of the disk device towards a target track of the disk;
• (b) counting the number of mirror signals detected during movement of the pickup, where each mirror signal is associated with a respective track radially arranged on the disk;
• (c) determining if movement of the pickup has been completed by comparing the counted number of mirror signals to a predetermined number of tracks required to reach the target track and stopping the movement of the pickup if the counted number of mirror signals equals the predetermined number of tracks;
• (d) checking respective interval lengths of successive mirror signals;
• (e) determining whether said successive mirror signal interval lengths satisfy a predetermined relationship;
• (f) returning to step (b) if said predetermined relationship is satisfied;
• (g) determining whether an interval length of a mirror signal associated with a succeeding track of said successive mirror signals has been counted within a predetermined time if said successive mirror signal interval lengths do not satisfy said predetermined relationship;
• (h) executing a correction mode if said interval length of the mirror signal associated with the succeeding track has been counted within said predetermined time;
• and
• (i) executing a forced stop mode for said pickup if said interval length of the mirror signal associated with the succeeding track has not been counted within said predetermined time.

A method for performing a seek control operation for a disk device of the type having a pickup for reading/writing data from and to a disk, said method comprising the steps of:

• (a) moving the pickup of the disk device towards a target track of the disk;
• (b) counting the number of mirror signals detected during movement of the pickup, where each mirror signal is associated with a respective track radially arranged on the disk;
• (c) determining if movement of the pickup has been completed by comparing the counted number of mirror signals to a predetermined number of tracks required to reach the target track and stopping the movement of the pickup when the counted number of mirror signals equals the predetermined number of tracks;
• and
• (d) checking respective interval lengths of successive mirror signals when the counted number of mirror signals does not equal to the predetermined number of tracks thereby to execute a force to stop the pickup if there is a difference between the interval lengths.