Patent ID: 8767339

Claim:
A method for compensating spacing fluctuations between a dynamic flying height(DFH) read/write head and a selected disk track during read/write operations in a hard disk drive (HDD), comprising: providing a hard disk drive (HDD) having at least one rotatable disk therein and a DFH head flyable above said disk; positioning said DFH head above a track selected for performing a read or write operation; then compensating for spacing fluctuations between said track and said DFH head during said read or write operation by a compensation method further comprising: setting a variable power profile value: DFHwprof=TDprof−s/E, where TDprof is a touchdown profile determined as a function of a sector subdivision of said track, where s is a desired back-off spacing and where E is DFH efficiency at said track; then choosing a track reference value to set an origin of said variable power profile value; and using said referenced power profile variable, DFHwprof, as the DFH power level along corresponding sectors of said track, performing said read or write operation.