As the recording density of hard disk drives (HDDs) is being rapidly increased, current servo track writing method by using a conventional servo track writer has become more costly and technically difficult. In order to solve the problem, we proposed a new magntic contact duplication method using a lithographically patterned master disk. In this work, we report on the development of the master disk production process and the magnetic printing process for industrializing the self servo track writing method of HDDs.
We have developed a Magnet-Optical disk system, iD (Intelligent, Image) PHOTO disk as a next generation system for data storage. The iD PHOTO system is based on the AS-MO (Advanced Storage Magneto-Optical disk) and its media has a high capacity of 730 MB in a 50.8mm diameter single-sided disk. It is possible to rewrite data more than 1 million times at a high data transfer rate. It is ideal for data storage for DSC (Digital Still Cameras).
This paper presents the new consumer VCR format, MICROMV, and the high density recording technique for this format. Applying MR(Magneto-resistive) head to the helical tape drive, we have successfully recorded the areal density of 0.8 Gbit/inch^2, which is more than 3 times as large as that of the conventional DVC format. The small size cassette of 12cc volume using a 3.8 mm width Co-O evaporated tape stores one hour MPEG2 picture of 12Mbps rate, which corresponds to 6.5 giga bytes of data. We also developed the technique of power transmission to rotary drum and the method to compensate amplitude asymmetry of MR head output signal.
MagnetoResistive (MR) head was investigated for high recording density consumer-use VCR, which was using helical-scanning tape system. MR head based on NiZn ferrite and AlTiC substrate were already using for linear tape data storage system and Hard disk drive (HDD). By searching of lower wear material, we were successful for development of MR head which low wear and less partial wear were balanced after tape running test. This MR head is using for MICROMV format consumer-use VCR.