Periodic Cleaning of the Head-Disk Interface in a Hard Drive by Using Seek Measurements
Original Publication Date: 1998-Jul-01
Included in the Prior Art Database: 2005-Apr-04
In a hard drive, contamination on a slider airbearing can cause an incorrect slider flying height above the surface of a disk. In some cases, if the amount of contamination debris is excessive, a slider can crash into the disk surface destroying data. To avoid excessive contamination buildup, the sliders in a drive are periodically stopped and started in the take-off and landing zone located on the disk surfaces. This operation is known to remove debris from the airbearings. In an environment where drive performance is crucial, for example a server, unnecessary stopping and starting a drive is wasteful of resources. To ensure that drives are stopped and restarted at an appropriate interval in time (threshold), a measure of the seek lengths is used to determine the correct interval.