Microminiature hard disk drive with adaptive runout compensation

A disk drive information storage device comprising:

• a housing having a footprint that includes a first dimension of about 35 mm;
• a substantially rigid disk;
• a servo system that includes a servo compensator that generates an actuator adjustment signal in response to a position error signal for positioning a read/write head over a track on said disk;
• and
• a secondary servo system comprising:
• memory means;
• analyzer means, responsive to said position error signal, for generating a new cosine runout factor and a new sine runout factor wherein said new cosine runout factor and said new sine runout factor are acumulated in said memory as an accumulated sine runout factor and an accumulated cosine runout factor respectively;
• and
• said accumulated sine runout factor and said accumulated cosine runout factor are a sine runout factor and a cosine runout factor respectively*;
• and
• generator means, operatively coupled to said analyzer means, for generating a sector runout correction signal using said sine runout factor and cosine runout factor stored in said memory means wherein said analyzer means and said generator means are simultaneously operative during operation of said device thereby providing adaptive runout compensation for displacement of said disk from a true center of rotation of said device at any time during operation.

A disk drive information storage device comprising:

• a housing;
• a substantially rigid disk having a diameter in the range of from about 33 mm to about 34 mm;
• a servo system that includes a servo compensator that generates an actuator adjustment signal in response to a position error signal for positioning a read/write head over a track on said disk;
• and a secondary servo system comprising:
• analyzer means, responsive to said position error signal, for generating a runout factor wherein said analyzer means further compromises:
• a memory wherein is stored a cumulative runout factor;
• and
• means responsive to said position error signal, for generating a new runout factor;
• wherein said analyzer means generates said runout factor using said stored cumulative runout factor and said new runout factor;
• and
• generator means, operatively coupled to said analyzer means, for generating a sector runout correction signal using said runout factor wherein said analyzer means and said generator means simultaneously are operative during operation of said device thereby providing adaptive runout compensation for displacement of said disk from a true center of rotation of said device at any time during operation.

A disk drive information storage device comprising;

• a housing;
• a substantially rigid disk, said disk having a diameter in the range from about 33 mm to about 34 mm;
• a servo system that includes a servo compensator that generates an actuator adjustment signal in response to a position error signal for positioning a read/write head over a track on said disk;
• and
• a secondary servo system comprising:
• memory means;
• analyzer means, responsive to said position error signal, for generating a new cosine runout factor and a new sine runout factor wherein said new cosine runout factor and said new sine runout factor are accumulated in said memory as an accumulated sine runout factor and an accumulated cosine runout factor respectively;
• and
• said accumulated sine runout factor and said accumulated cosine runout factor are a sine runout factor and a cosine runout factor respectively;
• and
• generator means, operatively coupled to said analyzer means, for generating a sector runout correction signal using said sine runout factor and cosine runout factor stored in said memory means wherein said analyzer means and said generator means are simultaneously operative during operation of said device thereby providing adaptive runout compensation for displacement of said disk from a true center of rotation of said device at any time during operation.