Patent ID: 9251829
Filing Date: 2016-02-02
CPC Classification: G11B

Claim Text:
1. A method for calibrating and operating a dynamic flying height (DFH) controlled read/write head comprising: providing a hard disk drive (HDD) having a rotatable disk therein; providing a DFH controlled read/write head, said head or said HDD having a head-disk interference (HDI) sensor incorporated therein and said head having at least a first and second heater element, wherein said first heater element is located adjacent to a write gap and said second heater element is located adjacent to a read gap, wherein said read/write head is flyable above said rotating disk; then, while supplying power to said at least first and second heaters at a variable and controllable ratio, and, utilizing feedback produced by said HDI sensor, producing, thereby, corresponding protrusion profiles; measuring a clearance between a point on an ABS of said read/write head closest to said rotating disk for each of said protrusion profiles; then determining a reference ratio at which a protrusion profile producing a minimum clearance is attained; and determining a range of ratios about said reference ratio at which measurable minimal acceptable clearances are obtained; then setting a ratio within said range and operating said read/write head at that ratio; whereby said ratio also allows optimization of read-gap and write-gap clearances in preparation for switching between a reading and writing operation.