Research on extremely high capacity storage systems by perpendicular hard disk drives

使用永久性磁性记录的高容量存储系统被调查，以便在多媒体和高速网络技术中提供一个容量瓶颈和数据传输率的存储系统的解决方案。在特定的、对永久性磁性记录系统的错误率的评估中，信号处理是最关键的问题之一，第一个头部和磁盘是准备好的。一个在飞行幻灯片上的薄电影单杆头，为什么可以采用实际应用，已经开发出来。使用头部作为永久性双层磁盘的书写，MR头部的适应性被调查。对MR头部响应的理论表达式已被估计为任何给定头部和磁盘的读取性能。下一个：永久性存储的阅读渠道已经被研究过。我们建立了一个不同的均衡器，用于永久头部/磁盘系统的响应，如单个峰值脉冲和PRML错误率分析仪。严重的错误率在高密度超过300 kFRPI被证明是有效的。结果显示，带有单极和双层媒体的MR头部可以在实用的高密度存储系统中使用，以增加可观察的区域密度和信号信噪比限制。理论方法将Voronoi单元用于媒体建模，因为限制是由媒体噪音控制的，起源于永久媒体的磁性结构的有限大小。因此，它被预测为一个精细的磁性结构将产生更高的信号信噪比，即，better error rate at high densities.By above mentioned studies， potential of perpendicular magnetic recording for areal density of 100 Gbits/inch D12 y D1 has been demonstrated in association with high resolution MR head and low noise perpendicular double layer media。

High capacity storage system using perpendicular magnetic recording was investigated in order to give a solution for the bottle neck of capacity and data transfer rate of storage systems in multi-media and high speed network technology. In particular, evaluation of error rate for perpendicular magnetic recording system including signal processing was one of the most crucial issue.First heads and disks for experiments were prepared. A thin-film single-pole head on a flying slider, which could be adopted to practical application, was developed. Using the head as a write for perpendicular double layer disks, adaptability of MR head was investigated. Theoretical expression for the MR head response was derived to estimate read performance for any given head and disk. Next, read channel for the perpendicular storage was studied. We established a differential equalizer which transformed perpendicular step-like response into single peaking pulse and PRML error rate analyzer for the perpendicular head/disk system. Sufficient error rate at high densities more than 300 kFRPI was demonstrated. The results indicated that the single-pole head and double layer media with an MR head could be used in a practical high density storage systems.In order to increase attainable areal density, signal SNR limitation was explored. Theoretical approach employing Voronoi cell modeling for media indicated that the limitation was governed by media noise, which originated from finite size of magnetic structure of the perpendicular media. Therefore, it was predicted that fine magnetic structure brought higher signal SNR, i.e., better error rate at high densities.By above mentioned studies, potential of perpendicular magnetic recording for areal density of 100 Gbits/inchィイD12ィエD1 has been demonstrated in association with high resolution MR head and low noise perpendicular double layer media.