Storing information
In contrast to memory, storage provides a place to store data and programs before and after processing. Disks have become the most widely used medium for the storage part of the system. A disk is a circular platter on which a recording surface has been applied The most common type of disk is magnetic. It is coated with the same material found on audiotape, and it can be erased and used over and over. Another type, the optical disk, uses laser beams of light instead of the magnetic method to record and retrieve information. There are two types of magnetic disks: floppy disks and hard disks. Floppy disks are made from thin sheets of flexible plastic; hard disks are made from rigid platters of metallic or ceramic material. The device that plays the disk is called a disk drive. It contains the mechanical equipment needed to spin or rotate the disk and the read/ write head needed to record and retrieve information to and from the disk. Hard disk drives are large-capacity storage devices. They operate by the same principles as floppy disk drives, but at much faster speeds. Their capacities are measured in megabytes. The hard disk is used for storing large quantities of information and provides fast access to that information. The floppy disk drive is convenient for making backup copies of the data on the hard disk, making copies of files that can be mailed to friends or co-workers, and, of course, for putting new programs and information into the computer.
20. Answer the questions a. What is storage? Give the definition in your own words. b. What is the most widely used medium for storage? c. What types of disks can you list? d. What type are floppy and hard disks? What is the difference between them? e. What devices are needed to record and retrieve information to and from the disk?
21.Translate into English a. Блок електроживлення перетворює змінний струм стандартної мережі на постійний струм низької напруги. b. На системному блоці розміщено всі основні вузли комп’ютера. c. Тверді диски — це запам’ятовувальні пристрої великої ємності. d. Дисковод містить механічне обладнання, необхідне для обертання диску, та головку читання/запису. e. Ємність пам’яті вимірюється у байтах.
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