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Large Capacity Image File System Using Perpendicular Magnetic Recording

采用垂直磁记录的大容量图像文件系统

基本信息

批准号：
01850078
负责人：
NAKAMURA Yoshihisa
金额：
$ 10.75万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B).
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01850078/
关键词：
Perpendicular magnetic recording High density recording Large capacity Perpendicular recording head Image file Hard disk Contact recording Disk drive 垂直磁気記録外部記憶装置記録媒体軟磁性薄膜

项目摘要

We have developed a hard disk medium composed of a CoーCr perpendicular anisotropic layer and a soft-magnetic underlayer deposited on a glass substrate. We also introduced a new head suspending mechanics for contact recording on the hard disk. Consequently, good envelope of reproduced signal and highpasswear durability was achieved. Two kinds of thin films were developed for the main-pole of a perpendicular head. One is a Fe-Si/SiO_2 multiーlayered film with high saturationflux density of 20,000 Gauss to perform saturation recording easily. The other is a Co-Zr-Nb amorphous film with pitsat the film edge which were fabricated ro pin the magnetic wall to improved the instability of a reproduced signal. It was found that the reproduced sensitivity increases with decreasing trackwidth of the mainーpole. The highest reproduced sensitivity of 208nV_<o-p>/[um*tum*(m/s)] was achieved for the 6um trackwidth perpendicular head among all the perpendicular heads and ring heads reported so far.Error rate was measured using these heads and media. Error rate of 10^<-9> was obtained at linear density of 2,400 bits/mm and track density of 150 tracks/mm achieving a S/N of 30dB (P-P/rms). The error rate of 10^<-9> was also obtained at 4,000 bits/ mm and 10 tracks/mm. From these results, we conclude that these densities are practically available for the peripheral recording devices. Furthermore, we have constructed a 3.5-in. Hard disk drive with a recording capacity of 128MBytes (unformated) on the both sides of the disk, and this disk drive was used as a peripheral recording device in a full-color still image file system. We intend to exhibit and demonstrate the disk drive constructed for trial at the second perpendicular magnetic recording conference held at Hachimantai, Iwate, in October 1991.

我们研制了一种硬盘介质，它是在玻璃基片上淀积一层钴铬垂直各向异性层和一层软磁衬层。本文还介绍了一种新的接触式硬盘磁头悬挂机构。因此，实现了再现信号的良好包络和高耐磨性。研制了两种用于垂直磁头主极的薄膜。一种是Fe-Si/SiO_2多层膜，其饱和磁通密度高达20，000高斯，易于实现饱和记录。另一种是Co-Zr-Nb非晶薄膜，在薄膜边缘有凹坑，用来钉扎磁壁以改善再现信号的不稳定性。结果表明，再现灵敏度随主磁极磁道宽度的减小而增大。在<o-p>目前报道的垂直磁头和环形磁头中，6 um磁道宽度垂直磁头的再现灵敏度最高，达到208 nV/[um*tum*（m/s）]，并测量了这些磁头和介质的误码率。在<-9>2,400比特/mm的线密度和150磁道/mm的磁道密度下获得10 μ s的误码率，实现30 dB（P-P/rms）的S/N。在<-9>4，000比特/ mm和10磁道/mm下也获得了10 μ s的误差率。从这些结果，我们得出结论，这些密度实际上可用于外围记录设备。此外，我们还建造了一个3.5英寸的。硬盘驱动器的记录容量为128 MB（未格式化）的磁盘两侧，该磁盘驱动器被用作全色静止图像文件系统中的外围记录设备。我们打算在1991年10月在岩手八幡台举行的第二次垂直磁记录会议上展示和演示为试验而制造的磁盘驱动器。