The computer's external devices include input and output devices and external memory. External storage refers to storage other than computer memory and CPU cache, which can be used to store temporarily unused programs and data; external storage can store information for a long time and does not rely on electricity to save information (data can still be saved after a power outage) ), but driven by mechanical components, the speed is much slower than that of the CPU.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
The computer's external devices include input devices, output devices and external memory.
External storage, also known as auxiliary storage, refers to storage other than computer memory and CPU cache. This type of storage can generally still save data after a power outage.
External memory is characterized by large capacity and low price, but slow access speed.
External memory is used to store programs and data that are not used temporarily.
External memory is usually magnetic media or optical disks, such as hard disks, floppy disks, tapes, CDs, etc., which can store information for a long time and does not rely on electricity to store information, but is driven by mechanical parts and is faster than the CPU It seems much slower.
Common external memory
Floppy disk: The floppy disk uses a soft polyester material to make a prototype negative, and is coated with magnetic materials on both surfaces. . Commonly used floppy disks have a diameter of 3.5 inches and a storage capacity of 1.44MB. Floppy disks read data through a floppy disk drive.
U disk: U disk is also called "flash disk" and can store data through the USB port of the computer. Compared with floppy disks, U disks have replaced floppy disks due to their small size, large storage capacity, and ease of portability.
Hard disk: The hard disk is composed of an aluminum alloy original plate coated with magnetic material. Each hard disk is composed of several magnetic discs.
Tape memory: Tape is also called sequential access memory SAM. It has a large storage capacity, but the search speed is very slow, and is generally only used as a data back-up store. There are three types of tape drives used in computer systems: reel tape drives, data streaming tape drives, and spiral scan tape drives.
Optical disc storage: Optical disc refers to a disc that uses optical means to store information. It applies optical storage technology, which uses lasers to write information on a certain medium, and then uses lasers to read out the information. Optical disk storage can be divided into: CD-ROM, CD-R, CD-RW, and DVD-ROM, etc.
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