Large Capacity Image File System Using Perpendicular Magnetic Recording

我们已经开发了一个硬磁盘介质，由Co-Cr perpendicular anisotropic layer和一个软磁性underlayer deposited on a glass substrate。我们还为硬盘上的接触记录引入了一个新的头部悬挂机制。间接地，良好的环境，复制的信号和高通量的耐用性得到了实现。两种类型的薄电影是为一个永久性的头部的主要极点而开发的。一个是一个Fe-Si/SiO_2多层电影，高饱和通量密度为20，000高斯，易于执行饱和记录。另一个是一部带有Pitsat电影边缘的Co-Zr-Nb畸变电影，该电影边缘是制造的旋转别针，以改善复制信号的可持续性。它发现了由于主极的轨迹宽度而产生的敏感性增加的现象。最高的reproduced sensitivity of 208 nV_<o-p>/[um*tum*（m/s）] was achieved for the 6 um trackwidth perpendicular head among all the perpendicular heads and ring heads reported so far。错误率was measured using these heads and media。错误率为10^<-9>的线性密度为2，400位/毫米，150轨道/毫米的轨道密度为30分贝（P-P/rms）。10^<-9>的错误率也在4，000位/毫米和10个轨道/毫米之间丢失。根据这些结果，我们将考虑这些密度实际上可用于外围记录设备。更远，我们已经建造了一个3.5英寸的。硬盘驱动器在磁盘的两侧有128 MB字节的记录容量（未格式化），而这个硬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Iwate Hachimantai举行的第二次永久性磁性记录会议上进行演示和演示磁盘驱动器构造。

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.