以快閃記憶卡增加硬碟使用效率方案

Abstract

近年來隨著科技技術的日新月異，筆記型電腦的效能及電池續航力也隨著提升。以CPU為例，1995至今，CPU時脈速度已從100MHz大幅增加至現在的3800MHz，整整快了40倍。而其他零組件如快取記憶體、顯示晶片，匯流排頻寬…等等，也都有驚人的發展。但唯獨硬碟的發展非常緩慢。無論是在耗電量或者是使用效率方面，從 1995年代到現在，只成長2至3倍。 近幾年來，Flash記憶體技術的成熟，在效率及耗電量，都較硬碟來得更出色，而以往最令人詬病的價格，也隨技術的成熟大幅下降。另外在使用壽命上重複讀取次數也有所提升，已經可以到達100萬次以上的重覆讀寫。這些瓶頸被克服之後，Flash的使用已經成為儲存裝置的明日之星。 因此本篇論文的目的是希望提供一個方法，利用Flash先天上的優勢，與硬碟互相結合。使得硬碟在耗電量或使用效率上能獲得大幅的改善。

Recently, notebook computer has great improvement on its efficiency and battery life along with the ever-changing technology. For example, the clock rate of CPU has dramatically increased from 100MHz to 3800MHz since 1995, 40 times faster than ever. In addition, other components of computer, such as Cache, display chip, Bus, Ram, Device interface, and so on also have astonishing improvement. However, only the development of Hard Disk (HD) is behind schedule no matter for the power consumption or using efficiency. Since 1995, it has only developed 2 to 3 times better than before. During previous years, the technology readiness level of Flash Memory has become better than HD in terms of efficiency and power consumption. Even its controversial prices have substantially dropped with following the increasing level of technology readiness. Moreover, the frequencies of repeated read & write have also improved for its service life which has already reached the mark of over one million frequencies of repeated read & write. Thus, the use of Flash has become an emerging star of storage device after these bottlenecks have been resolved. Therefore, the target of this thesis tends to offer a solution which is able to use the natural advantage of Flash and to mutually combine it with HD in order to make great improvement in HD’s power consumption and using efficiency.