Green laser pointer helps a lot to draw attention

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The main memory used to store the procedures to be used immediately several request access to fast, usually constitute the semiconductor memory. According to the requesting access to fast, usually constitute a semiconductor memory. Auxiliary memory used to store information not currently needed for immediate use for the storage of information are not currently needed for immediate use, the auxiliary memory used to store the current does not require immediate use, when they need to exchange data, and then and the main memory in batches. Once the need to exchange data in batches, and the main memory. It is the host of the external device as the main memory back-up and supplementary deposit back-up and complement, is the host of external devices, so-called external memory.green laser pointer helps a lot in drawing the students’ attention. For the external memory. Auxiliary memory is characterized by large capacity, low cost, the auxiliary memory is characterized by large capacity, low cost, usually after a power outage can still save the information, non-volatile memory even after power to save the information is non-volatile volatile "memories. 2 computer component principle 8.1 auxiliary memory types and technical indicators on the current market the popular memory of the auxiliary magnetic surface deposit auxiliary storage currently popular on the market mainly in the magnetic surface of the memory and optical memory class two categories of storage and optical memory. the School of Computer Science magnetic surface memory is a magnetic material deposited in the disc (or with) the magnetic surface memory is of magnetic material deposited in the disc (or band) magnetic materials deposited in the disc the matrix formed on the recording medium, the matrix formed on the recording medium, and the relative motion of the coil around the head and the recording medium to write or read information. the relative motion of the recording media to write or read information. green laser pointer helps to draw audience’s attention on the lecture emphasis.modern The computer system used in the magnetic surface of memory but also the digital magnetic recording and analog magnetic recording two kinds of word-type magnetic recording and analog magnetic recording two. computer principle 8.1 The auxiliary memory types and technical indicators CD-ROM CD-ROM of the computer system memory CD-ROM for computer system memory CD-ROM disc memory CD-ROM of Computer Science is the use of stored information, the capacity of the disc than the disk capacity of the laser beam on the surface of the photosensitive characteristics disc capacity than the capacity of the disk of the main technical indicators of the auxiliary memory is the storage density, the main technical indicators of the auxiliary memory is the storage density, storage capacity, storage density, volume, addressing time addressing time 4 Principles of Computer Organization 8.1 auxiliary memory types and technical indicators. storage density storage density refers to the magnetosphere surface of unit length or unit area stored in binary storage density per unit length or the magnetosphere per unit area of the surface of the stored binary information content. What green laser led does helps the process of lecture.disk storage, the track density and bit density, the amount of information for disk storage, the track density and bit density, the product of the two.