Title :
Dynamic Measurement of a Head-Disk Spacing Variation for High Density FDD
Author :
Ajiki, K. ; Okumura, T. ; Hayakawa, Y. ; Hirano, A.
Author_Institution :
NEC Corp.
Abstract :
A head-disk interface (HDI) analyzer for high-density floppy disk drives (FDDs) was improved. This equipment consists of a high-shutter-speed camera and a highly sensitive image processor. It makes possible the evaluation of dynamic spacing fluctuation by analysis of interference fringe patterns on both sides of a floppy disk (FD). With this equipment, the dynamic motions of an up-head slider and FD were observed. Moreover, it was shown that the surface roughness of the FD affects the head contact and that a smoother disk surface causes larger fluctuations in spacing. This result indicates that a surface of appropriate roughness is required of FDs so as to maintain reliability in high-density FDDs.
Keywords :
Cameras; Density measurement; Drives; Floppy disks; Fluctuations; Head; Interference; Pattern analysis; Rough surfaces; Surface roughness;
Journal_Title :
Magnetics in Japan, IEEE Translation Journal on
DOI :
10.1109/TJMJ.1994.4565923