The feasibility of high areal density perpendicular magnetic recording was investigated in a hard disk system using a contact type single-pole head and a Co-Cr/Ni-Fe medium. The overall spacing loss in recording and reproduction processes was found to be 100 to 110 d/λ, (dB) at densities over 1001(FRPI and at small spacings below 0.1μm. The error rate was measured to evaluate the disk drive operation at a head-to-medium spacing of 340A. The error rate of 10-9and the phase margin of 40% were achieved at 1001SRPI and 100μm trackwidth without an equalizer. Furthermore, the error rate of 10-9 was obtained at 1101(FRPI and 100μm trackwidth, or at 60kFRPI and 6μm trackwidth, using a cosine equalizer introduced to reduce the pattern peakshift.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering