Simulation
Simulation of the Floppy-Disk/Head Interface
G.G. Adams
Summary
Magnetic recording on floppy disks can be performed with the read/write head in
contact or noncontact with the magnetic medium. High speed operation, with
acceptable limitations on wear, makes out-of-contact recording more desirabe.
However, high density noncontact recording requires head-to-disk spacings of
less than 0.25 micrometers, and so special attention must be given to the design
of the magnetic heads in order to allow an appropriate air bearing to develop.
An efficient analytical model of the spinning disk is presented which includes
the effect of the entire disk on the deflections in the head region. This model
is coupled with the Reynolds equation of lubrication which describes the air-bearing
behavior. The coupling procedure allows the deflected disk shape to change more
rapidly than does the minimum disk-to-head spacing so as to facilitate convergence.
Results are presented for various cases and compared to those from another model.
Dr. George G. Adams