The disk drive industry is fast-paced and competitive. As the time passing by, the new generation of hard disk have introduced the new design, implement an advance technologies and good materials in the hard disk. 2.1 History Of Hard Disk According to Dixon (2005), the history of hard disks began in 1955 with the IBM 305 computer. For many years, the hard disk were large, cumbersome devices where it was more suited to be used in the protected environment of a data center or large office rather than in a harsh industrial environment according to their delicacy, or small office or home due to their size and power consumption. A hard disk also known as HD or HDD drive is common data storage for computers.
More and more laptops and even desktops are moving to the technology because of the performance benefits. Solid state disks use
Recent advance in advances in hardware technology re-kindled the interest in implementing in-memory databases as a means to provide faster data accesses and real-time analytics , , , . Most commercial database vendors (e.g., SAP, Microsoft, Oracle) have begun to introduce in-memory database to support large-scale applications completely in memory , , , . Nevertheless, in-memory data management is still at its infancy with many challenges , , , , and s completely in-memory design is not only still prohibitively expensive, nut also unnecessary. Instead, it is important to have a mechanism for in-memory database that utilize both memory and disks effectively. It is similar to the traditional caching process, which is however the other way around: instead of fetching data that is needed from disk into main memory, cold data is evicted to disk, and fetched again only when needed.
In the 1960’s, computer technology began to transform our social, economic, and governmental infrastructures. Data, formerly transcribed or maintained primarily in paper form, were instead being captured electronically as binary digits understandable to computers. This process is called digitization. The computers used at the time where called mainframes. They were very large and very expensive and used proprietary architectures that did not support cross-platform communications.
3. There is dearth of reliable market information at competitive prices. Thus exploiting this significant demand-supply gap would prove to be a highly rewarding opportunity. 4. Technical Data Corp had the opportunity to start publishing their data with the Telerate Systems Incorporated which had 3900 separate keyboards installed worldwide as of August 1980 and had planned further expansion.
The fact that PCs have such a large customer base that ranges from government to business to personal use means that the bargaining power of individual customers is low. There are also high switching costs associated with switching from one brand to another, and there is also a lot of brand loyalty in the PC market. The main power that customers currently have is the ability to choose substitutes, since PC-like capabilities are now featured on many mobile devices. Ultimately, the bargaining power of customers is a moderate force that is growing stronger as non-PC technology advances. Since more and more consumer products such as smart phones and tablets are now able to perform functions that were previously PC-exclusive, increasing the number of substitutes, PCs have become less unique in some of their capabilities.
Big Data databases, such as Mongo DB, solve these problems and provide companies with the means to create tremendous business value. 1.4 Unstructured Data in a Big Data Environment Unstructured data is data that does not follow a specified format for big data. If 20 percent of the data available to enterprises is structured data, the other 80 percent is unstructured. Unstructured data is really most of the data that you will encounter. Until recently, however, the technology didn’t really support doing much with it except storing it or analyzing it manually.
We can not deny the large effect of information technology on how we complete our work in the recent decade. Everything has been done with highly correctness, and less time is needed to finish one work. Besides, information technology changed many things to digital signal, and keep it. The computing ability of computer is questionable anymore, processing speed is increasing day by day, which clearly make computer to run everything faster. Computer is a significant example in information technology, many other example are mobile phone, PDA, internet, satellite signal...
Since the invention of computers back in 1938, it has become a necessity for many people in their everyday lives. From A.T.M. machines to cellular phones, computers remain the driving-point that keep things together. In today’s modern age, one needs computer skills to stay competitive in finding a job, maintaining a job, and improving one’s life in this day and age. Here in the U.S., unemployment has risen to an extremely high level.
Contemporary ROM chips RAM (Random Access Memory) A random-access device allows stored data to be accessed directly in any random order. In contrast, other data storage media such as hard disks, CDs, DVDs and magnetic tape, as well as early primary memory types such as drum memory, read and write data only in a predetermined order, consecutively, because of mechanical