NEW DISC FORMAT FOR LAND GROOVE RECORDING ON MAGNETICALLY INDUCED SUPERRESOLUTION DISC/

We developed a new disc format for land/groove recording. The new disc had grooves wobbled on one side to obtain address information. We exa mined characteristics of signals reproduced from the wobbled grooves a nd a suitable groove shape for a double-layered magnetically induced s uper-resolution disc. By the use of the new disc format, good signal q uality of address information is obtained on both lands and grooves. A t a groove shape with 40 nm depth and 0.7 mu m track pitch, a CNR of 4 7 dB and a crosstalk of -32 dB were obtained at the recorded mark leng th of 0.55 mu m in magnetic field modulation recording.