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Idle Algorithm to Minimize Slider/Disk Lubricant Interactions

IP.com Disclosure Number: IPCOM000016068D
Original Publication Date: 2002-Jul-10
Included in the Prior Art Database: 2003-Jun-21

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Background This invention publication relates to an idle algorithm for a disk drive that minimizes the formation of lubricant droplets on the disk. A major problem for disk drives today, as flying heights are rapidly decreasing, is the fact that the slider interacts strongly with the disk lubricant. One phenomenon that has been demonstrated to be a problem is when lubricant gets picked up by the slider during normal operations, and subsequently dropped on the surface of the disk. Most of the time, the droplet spreads back or gets sheared off by the air shear or the slider. However, there is a finite probability that the head will write when the slider encounters a lubricant droplet sitting on the disk. When this happens, a significant vertical excursion of the slider happens and the signal does not get written properly, leading to a hard error. Most of the lubricant pickup to the slider happens when the slider is sitting on-track. This invention publication relates to an idle algorithm whereby the seek sequencing during idle is such that it minimizes the lubricant pickup to the slider and at the same time smears off any potential lubricant accumulation on the disk. Lubricant Depletion from the Disk