DEVELOPMENT OF A RECORDING CHANNEL OF EXCEPTIONALLY HIGH DATA TRANSFER RATE

Abstract

  An experimental high-speed magnetic recording channel using a new metal alloy composite head with 150 MHz bandwidth capability and metal particle tape has been constructed. At the linear density of 4 kfr/mm (95 to 100 kfr/in) and Nyquist frequency of 150 MHz, the measured 300 kHz slot SNR was greater than 32 dB. Using a DC-free 11-12 code at a data rate of 250 Mbit/s and density of 3.35 kfr/mm (85 kfr/in), error rates of 1x10^-5 were measured. Under these conditions, a 300 kHz slot SNR of 37.5 dB at 125 MHz was measured.