Servo system for disk-flutter in rotating storage systems

An information processing system comprising:

• a rotating disk platter;
• a read/write transducer positioned over the rotating disk platter;
• and
• a servo feedback loop for providing a position error signal to position the read/write transducer over the rotating disk platter, the feedback loop including at least one narrow band filter with a center frequency set to at least one disk-flutter mode, the disk-flutter mode being primarily caused by airflow-induced movement of the rotating disk platter normal to its surface.

An information processing system comprising:

• a rotating disk platter;
• a read/write transducer positioned over the rotating disk platter;
• and
• a servo feedback loop for providing a position error signal to position the read/write transducer over the rotating disk platter, the servo loop including a lag-lead filter to compensate for disk-flutter-induced disturbances on the read/write transducer, the disk-flutter being primarily caused by airflow-induced movement of the rotating disk platter normal to its surface.

A method of operating a rotating media storage system to reduce disk-flutter effects comprising the steps of:

• inducing a first disk-flutter mode characterized by a first spectrum centered at approximately a first frequency on a disk platter by rotating the disk platter, the disk-flutter mode being primarily induced by movement of the rotating disk platter normal to its surface due to airflow;
• providing a position error signal to a servo feedback loop;
• filtering the position error signal with a first peak filter;
• and
• positioning a read/write transducer over the disk platter based at least partially on the position error signal.