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2025-01-18 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Internet Technology >
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This article mainly introduces what the external memory uses magnetic media, which is very detailed and has a certain reference value. Friends who are interested must read it!
In the external memory, the memories that use magnetic media are: floppy disk, hard disk, magnetic tape. The floppy disk is made of a prototype negative made of soft polyester material, and the two surfaces are coated with magnetic material; the hard disk is composed of aluminum alloy original disk coated with magnetic material; the magnetic tape is made by coating a layer of granular magnetic material on the tape base or evaporating a layer of magnetic oxide or alloy film.
There are many kinds of memory, according to its use can be divided into main memory and auxiliary memory, main memory also known as internal memory (referred to as memory), auxiliary memory also known as external memory (external memory).
External storage refers to the storage in addition to computer memory and CPU cache, which can still hold data after power off.
The most prominent feature of internal memory is fast access speed, but small capacity and high price, while external memory is characterized by large capacity, low price, but slow access speed.
Internal memory is used to store programs and data that are needed immediately; external memory is used to store programs and data that are not in use for the time being. Information is often frequently exchanged between internal memory and external memory.
External memory is usually magnetic media or optical disc, such as hard disk, floppy disk, magnetic tape, CD, etc., which can store information for a long time, and does not rely on electricity to save information, but driven by mechanical parts, the speed is much slower than CPU.
Floppy disk: a floppy disk is made of a prototype film made of soft polyester material and coated with magnetic material on both surfaces. The commonly used floppy disk is 3.5 inches in diameter and has a storage capacity of 1.44MB. A floppy disk reads data through a floppy disk drive.
U disk: U disk, also known as "flash drive", can store data through the computer's USB port. Compared with floppy disk, U disk has taken the place of floppy disk because of its small size, large storage capacity, easy to carry and many other advantages.
Hard disk: hard disk is composed of aluminum alloy original disk coated with magnetic material, and each hard disk is composed of several magnetic disks.
Magnetic tape memory: magnetic tape is also known as sequential access memory SAM. It has a large storage capacity, but the search speed is very slow, and it is generally only used as data backup storage. There are three types of tape drives used in computer systems: disk tape drive, data stream tape drive and spiral scan tape drive.
Magnetic tape is a kind of magnetic recording material with magnetic layer, which is used to record sound, image, digital or other signals. it is the most productive and widely used magnetic recording material. It is usually formed by coating a layer of granular magnetic material on the plastic film substrate (support) or evaporating a layer of magnetic oxide or alloy film. Once used paper and celluloid as the base, now it mainly uses polyester film with high strength, good stability and not easy to deform.
Optical disk memory: an optical disc refers to a disk in which information is stored optically. It uses optical storage technology, even if the laser is used to write information on a certain medium, and then the laser is used to read out the information. Optical disk memory can be divided into: CD-ROM, CD-R, CD-RW, and DVD-ROM and so on.
The above is all the contents of the article "what is the memory that uses magnetic media in the external memory?" Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!
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