As we know, computers mainly by CPU, memory, hard drives, input/output devices and other common components. Each of them hold different jobs. CPU is a computer calculation core and control core, is mainly responsible for analytical computer instruction and operation. Memory, also known as main memory, CPU is directly addressable storage space. Main feature is the access speed. Your hard disk is where we store data. We usually use programs that are installed on your hard drive, when we want to open a program or use a program, you must first transfer them into memory in order to run.
Here playing a metaphor, on like in a study, we will put not see of book put in bookcase Shang, and this store book of bookcase on equivalent to computer of hard disk, dang we need reading or Office Shi only will put book from bookcase in out put to desks Shang, and this desks on equivalent to memory, as see not reading or see which this book is is by we to decided of, so we on equivalent to served as with CPU of work.
Assuming the bookcase easy enough one day we will no longer need his desk, that is when the hard drive is fast enough, we would no longer need memory?
Theoretically feasible, but like Windows, Unix, iOS, these mainstream Linux operating systems are based on the von Neumann architecture. If we cancel the memory can be very CPU-memory-hard disk the schema from the three-tier system into a CPU-two-tier structure of the hard disk, which means that we have to change these operating systems. Therefore, from this point, considering the cost, estimated that many people are unwilling to do so.
For hard drive repeatedly erased the hard disk is damaged, and for memory do not have this problem. Ever see a metaphor saying "hard drive is like paper and pencils, pencil writing on paper can be erased, but the number erase much, paper will be worn by rubber. Memory is like a whiteboard and markers, you can erase the countless times without fear of breakage. " DKNY iPhone
In addition, even if the hard drive's read/write speed with the development of solid state drives, has been continuously refresh limit, but from the production process, memory speed is more difficult than hard disks. Which means faster hard disks at the same time, the memory speed is not stagnant, and the CPU speed is constantly updated. So memory speed buffer between the CPU and hard drive are still necessary.
Even fairly fast hard disk cannot directly replace the memory. Just like mobile phones along with camera, music features, but phone is not a substitute for a camera, sound the same. But this is not absolute, if mobile phones can achieve the professional cameras, the degree of professional audio, perhaps replacing is not possible. The computer, if developers are willing to pay the cost of the operating system will support infrastructure to existing operating systems change, improvement and regardless of cost, production, and so on. Memory may also be disappearing, but this might be small.
Here, after all, not only technology problems involve too much industry interest. This may be the main reason.
Of course, some people may ask, since it can not replace hard drive memory, memory can replace the hard drive? DKNY iPhone 6 Case
From the cost point of view, few people would be willing to try to do this, after all, now costs about 30 yuan/g memory, and SSD's cost is about 2/g, mechanical hard drives are needless to say. In addition in addition to the cost to resolve the volatile memory problem. These reasons are because they cannot replace each other.
[Article correction]
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Tags:PC and hardware Science and technology
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