In this report, in order to understand particle induced friction (PIF) in sliding friction, previous results and theory regarding PIF were reviewed and introduced into nano technology application “head-disk interface (HDI)” in hard disk drive (HDD) as example. The theoretical analysis of PIF in HDI provided the results, i.e. (1) interfering nano particles can generate high contact pressure more than a few GPa levels, (2) at the contact area generated by interfering particles, the PIF theory assumes generating extremely high temperature as well as the energy in a power generator, and (3) from the point of (2), in order to check the number of interfering nano-particle, TA (thermal asperity) measurement will be effective more than small vibrating signal by AE (acoustic emission) or friction force by piezo sensor, moreover, (4) the PIF theory can point the main cause in HDI issues, which are (i) load force and (ii) sliding velocity in HDI could not be down-scaled like particle size, contact area, flying height called “nano technology”.

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