新类型嵌入式64G SSD缩小体积扩充容量

随着超薄硬件在移动电脑领域未来几年的成长,先进的操作系统将需要更好的存储产品.业界闪存产品领导厂商SanDisk(闪迪)公司日前推出首款新类型嵌入式固态硬盘(SSD).     

Future hard disk drive systems

This paper briefly reviews the evolution of today's hard disk drive with the additional intention of orienting the reader to the overall mechanical and electrical architecture. The modern hard disk drive is a miracle of storage capacity and function together with remarkable economy of design. This paper presents a personal view of future customer requirements and the anticipated design evolution of the components. There are critical decisions and great challenges ahead for the key technologies of heads, media, head-disk interface, mechanics, and electronics.     

Stepped side shield writer for perpendicular recording

To increase the track density in hard disk drive (HDD), the write head fringing field should be controlled. The side shield is one of the candidates to reduce the fringing stray field. Although the wrap-around type [K. Nakamoto, et al., IEEE Trans. Magn. 41(10) (2005) 2914] and many other side shield structures [Y. Kanai, et al., IEEE Trans. Magn. 39(4) (2003) 1955; D.T. Wilton, D.J. Mapps, IEEE Trans. Magn. 29 (1993) 4182] were proposed, these side shield structures have a trade-off between the track edge field sharpness and the maximum write field strength on the center track. In this paper, we propose the new side shield writer called the stepped side shield (3S) head. The 3S head satisfies both the on-track write field strength and reduction of the adjacent track stray field. The track edge field sharpness is much improved especially in the high skew angle recording. We studied the 3S head effect by the statistic field simulation.     

一种高清晰度硬盘录放机

介绍了一种简单、可靠、功能强大且性价比高的高清晰度硬盘录放机整体方案。它可实现TS流的输入、解码、显示并将其以独创的文件系统格式存储到硬盘中;还可对硬盘中的高清视频文件进行各种特技播放等操作,具有强的容错能力。     

基于DSP的磁存储设备抗冲击技术控制系统的设计与实现

磁存储设备(主要指微型硬磁盘)是应用广泛的信息存储器件,研究微型盘的抗振动、冲击的控制技术对于在恶劣环境下工作的硬盘和便携式计算机具有重要意义.本文在确立采用外加固主动控制方案的基础上,提出了数字主动控制系统的设计思路,并且实现了以DSP为核心的数字控制系统的软、硬件设计方案.     

Differential Analog Data Path DC Offset Calibration Methods

DC offset causes performance degradation in signal processing systems especially for high-speed applications. A new offset cancellation method that relaxes the requirement for the offset of the circuit components in the differential analog data path to about 10 times larger is introduced. This method moves the adjusting target from analog-to-digital converter (ADC) to its input buffer and adjusts DC level of ADC input to its center before the final offset cancellation. It eliminates post-production adjustment such as fuse trimming, which increases the cost and TAT in manufacturing and testing. Execution and simulation times are shortened down to 1/9 for less settling time in buffer and with improved logic. An automatic quick offset calibration circuit is implemented in a small silicon space in a high-speed hard disk drive (HDD) channel with 0.25-m four-layer metal CMOS process. The measured data show this method works effectively in this system.     

未来数据储存技术与硬盘的发展

走过了半个世纪的磁储存技术,小型化牵动着数据储存和计算机硬盘到达了从未有过的高度。正在研究发展的热辅助记录技术和图形媒介技术将会给磁记录硬盘带来更高的面密度,从而使小型化在磁储存的框架内还将有一段路可走。但由于其物理限制,磁硬盘无法永远继续小下去,人们正在寻找新的出路。因此除了对磁储存正在发展的两项新技术之外,特别是对完全另辟新路的非磁数据储存技术,如纳米机械AFM数据储存技术、全息光储存技术以及原子储存技术进行了论述,以显示当前该领域前沿科技的发展概貌。     

DSP在磁存储设备抗冲击技术中的应用

磁存储设备是应用广泛的信息存储器件,研究其抗振动、抗冲击的控制技术对于在恶劣环境下工作的硬盘和便携式计算机具有重要意义.本文在采用外加固主动控制方案的基础上,提出数字主动控制系统的设计思路,并且详细阐述以DSP为核心的数字控制系统的软、硬件设计方案.     

Review of perpendicular magnetic recording research at Fujitsu

Perpendicular magnetic recording (PMR) research and development (R&D) was carried out at Fujitsu for 32 years from 1978 to 2009, separated into three stages. We developed PMR for use in hard disk drives (HDDs). We sputtered Co-Cr alloy thin film onto a disk substrate and evaluated it using thin-film heads. Some interesting results were obtained at each stage. On the way we fabricated 1.8″ HDDs in 1992 and finally shipped the mass-produced PMR HDDs in 2006. Unfortunately, the HDD business at Fujitsu closed down. I would like to review the exceptional PMR research undertaken at Fujitsu.     

CPP-GMR technology for magnetic read heads of future high-density recording systems

This paper introduces CPP-GMR technology, its features, routes to output enhancement, problems to be solved and possibilities as a recording head. For instance, use of high spin-dependent bulk scattering, high resistivity, or half-metallic magnetic materials for free and reference magnetic layers were shown as ways to improve the output of CPP-GMR. A current state of CPP-GMR head development was also mentioned in view points of sensor downsizing, magnetic head noise and high-density recording demonstration. CPP-GMR still has some points to be improved, however it is believed that the CPP-GMR will actualize a next high-performance magnetic read head in no distant future.