Advanced Digital Controls for Disk Drives

0072752消息商业、科学和工程中软件的复杂性和大小的快速增加，以及在商业、政府和医疗应用的数据库中存储越来越大量的信息的需要，推动了对具有更高数据传输速率、更高容量和物理上更小的数据存储设备的不断增长的需求。 在未来几年中，随着磁盘驱动器在便携式和无线设备中的使用变得普遍，预计这种趋势将急剧上升。 为了满足这一需求，目前数据存储密度的年增长率为每年100%。 这种增长的大部分来自磁道密度的增加，因为磁记录介质和读写磁头的物理限制。 这给伺服系统带来了不成比例的负担，使磁头保持在数据磁道中心附近，以获得驱动器的良好读/写性能。 为了提高磁盘驱动器伺服系统的性能以支持数据存储密度的增长率，必须开发新的和先进的分析技术，专门解决磁盘驱动器机械的复杂动力学问题。 此外，由于磁盘驱动器的控制器本质上是离散时间的，因此存在许多关于必须同时响应离散时间和连续时间信号的控制系统的混合性质的问题。 这种方法的构建需要一系列的研究工作，从基础理论的发展到特定领域的计算算法的创建，再到这些算法在适当的测试设备上的实现。以及（2）将这些方法成功地演示并应用于试验台磁盘驱动器系统。 这里提出的工作的两个主要特点是，PI的将直接解决的混合性质的磁盘驱动器控制，连续和离散信号必须直接面对和PI的将统一的方法来控制两个单独的功能的磁盘伺服，即跟踪和跟踪到跟踪寻求。 所提出的方法和途径将通过为当前和未来的磁盘驱动器的控制设计提供系统的方法来帮助美国主导的600亿美元的数据存储行业的竞争力。 此外，开发的许多分析工具将适用于替代机械应用，从磁盘驱动器控制设计的完整处理和评估中获得的见解将用于其他相关技术。

0072752MessnerThe rapid increase in the complexity and size of software in business, science and engineering, and the need to store increasingly large amounts of information in data bases for commercial, government, and medical applications has propelled the growing demand for data storage devices that have higher date transfers rates, have higher capacity, and are physically smaller. In future years this trend is expected to rise dramatically as the use of disk drives in portable and wireless devices becomes widespread. To respond to this demand, the current annual rate of increase in data storage density is 100% per year. The majority of this increase comes from increases in track density, because of physical limitations on magnetic recording media and read and write heads. This places disproportionate burden on the servo system to keep the head near the data track center for good read/write performance of the drive. Reduced latency times to reach data on different data tracks also requires higher performance servo systems.To improve the performance of disk drive servo systems to support the rate of increase in data storage density, new and advanced analytical techniques must be developed that specifically address the complex dynamics of the disk drive mechanics. Furthermore, there are many issues concerning the hybrid nature of the control system which must simultaneously respond to both discrete-time and continuous-time signal, since the controllers for disk drives are inherently discrete-time. The construction of such methods requires a spectrum of research effort ranging from the development of fundamental theory to the creation of domain specific computational algorithms to the implementation of these algorithms on appropriate test facilities.The broad objectives of this research proposal are (1) to develop high performance design methods for control of disk drives, which have further general use; and (2) to demonstrate and apply these methods successfully to testbed disk drive systems. Two major features of the work proposed here are that the PI's will directly address the hybrid nature of disk drive control where both continuous and discrete signals must be directly confronted and that the PI's will unify the approach to control for the two separate functions of the disk servo, namely track following and track-to-track seeking. The proposed methods and approach will assist the competitiveness of the US dominated $60 billion data storage industry by providing systematic methods for control design for current and future disk drives. Furthermore, many of the analytical tools developed will be applicable to alternative mechanical applications, and insights gained from this complete treatment and evaluation of disk drive control design will be parlayed into other related technologies.