Text 2. STORAGE DEVICESStorage medi

Text 2. STORAGE DEVICES
Storage media are classified as primary storage or secondary storage on the basis of combinations*of cost, capacity, and ac¬cess time. The cost of storage devices is expressed as the cost per bit of data stored. The most common units of cost are cents, millicents (0.001 cents) and microcents (0.000001 cents). The time required for the computer to locate and transfer data to and from a storage medium is called the access time for that medi¬um. Capacities range from a few hundred bytes of primary storage for very small computers to many billions of bytes of archival storage for very large computer systems.
Memories may be classified as electronic or electromechanical. Electronic memories have no moving mechanical parts, and data can be transferred into and out of them at very high speeds. Electromechanical memories depend upon moving mechanical parts for their operation, such as mechanisms for rotating magnetic tapes and disks. Their data access time is longer than is that of electronic memories; however they cost less per bit stored and have larger capacities for data storage. For these reasons most computer systems use electronic memory for primary storage and electromechanical memory for secondary storage.
Primary storage has the least capacity and is the most expen¬sive; however, it has the fastest access time. The principal primary storage circuit elements are solid-state devices: magnetic cores and semiconductors. For many years magnetic cores were the principal elements used in digital computers for primary storage. The two principal types of semiconductors used for memory are bipolar and metal-oxide semiconductors (MOS). The former is faster, the latter is more commonly used at present. Because data can be accessed randomly, semiconductor memories are referred to as random-access memory, or RAM.
There is a wide range of secondary storage devices. Typical hardware devices are rotating electromechanical devices. Mag¬netic tapes, disks, and drums are the secondary storage hardware most often used in computer systems for sequential processing. Magnetic tape, which was invented by the Germans during World War II for sound recording, is the oldest secondary storage medium in common use. Data are recorded in the form of small magnetized "dots" that can be arranged to represent coded patterns of bits.
Tape devices range from large-capacity, high-data-rate units used with large data processing systems to cassettes and cartridges used with small systems. Magnetic disk storage, introduced in the early 1960s, has replaced magnetic tape as the main method of secondary storage. As contrasted with magnetic tapes, magnetic discs can perform both sequential and random pro¬cessing. They are classified as moving-head, fixed-head, or com¬bination moving-head and fixed-head devices. Magnetic discs are the predominant secondary storage media. They include flexible, or floppy discs, called diskettes. The "floppies" were introduced by IBM in 1972 and are still a popular storage me¬dium to meet the demands of the microcomputer market.

Результаты (английский) 1:

Text 2. STORAGE DEVICESStorage media are classified as primary storage or secondary storage on the basis of combinations * of cost, capacity, and ac ¬ cess time. The cost of storage devices is expressed as the cost per bit of data stored. The most common units of cost are cents, millicents (0.001 cents) and microcents (than 0.000001 cents). The time required for the computer to locate and transfer data to and from a storage medium is called the access time for that medi um ¬. Capacities range from a few hundred bytes of primary storage for very small computers to many billions of bytes of archival storage for very large computer systems.Memories may be classified as electronic or electromechanical. Electronic memories have no moving mechanical parts, and data can be transferred into and out of them at very high speeds. Electromechanical memories depend upon moving mechanical parts for their operation, such as mechanisms for rotating magnetic tapes and disks. Their data access time is longer than is that of electronic memories; However they cost less per bit stored and have larger capacities for data storage. For these reasons most computer systems use electronic memory for primary storage and electromechanical memory for secondary storage.Primary storage has the least capacity and is the most expen sive ¬; However, it has the fastest access time. The principal primary storage circuit elements are solid state devices: magnetic cores and semiconductors. For many years the magnetic cores were the principal elements used in digital computers for primary storage. The two principal types of semiconductors used for memory are bipolar and metal oxide semiconductors (MOS). The former is faster, the latter is more commonly used at present. Because data can be accessed randomly, semiconductor memories are referred to as random-access memory, or RAM.There is a wide range of secondary storage devices. Typical hardware devices are rotating electromechanical devices. Mag netic ¬ tapes, disks, and drums are the secondary storage hardware is most often used in computer systems for sequential processing. Magnetic tape, which was invented by the Germans during World War II for sound recording, is the oldest secondary storage medium in common use. Data are recorded in the form of small magnetized "dots" that can be pre-arranged to represent coded patterns of bits.Tape devices range from large-capacity, high-data-rate units used with large data processing systems to cassettes and cartridges used with small systems. Magnetic disk storage, introduced in the early 1960s, has replaced magnetic tape as the main method of secondary storage. As contrasted with magnetic tapes, magnetic discs can perform both sequential and random pro cessing ¬. They are classified as a moving-head, fixed-head, or com bination ¬ moving-head and fixed head devices. Magnetic discs are the predominant secondary storage media. They include flexible, or floppy discs, so-called diskettes. The "floppies" were introduced by IBM in 1972 and are still a popular storage me ¬ dium to meet the demands of the microcomputer market.

Результаты (английский) 2:

2. the STORAGE DEVICES the Text
the Storage media are classified as with the primary or the secondary storage storage on the basis of * Combinations of cost, capacity, and ac¬cess time. The cost of storage devices is expressed as the cost per bit of data stored. The most common units of cost are cents , millicents (0.001 cents) and microcents (0.000001 cents). The time required for the computer to locate and transfer data to and from a storage medium is called the access time for that medi¬um. From a range Capacities FEW hundred bytes of the primary storage for very small computers to MANY BILLIONS of bytes of archival storage for very large computer Systems.
's Memories may the BE classified as with electronic or electromechanical. Electronic memories have no moving mechanical parts, and data can be transferred into and out of them at very high speeds. Electromechanical memories depend upon moving mechanical parts for their operation, such as mechanisms for rotating magnetic tapes and disks. Their data access time is longer than is that of electronic memories; however they cost less per bit stored and have larger capacities for data storage. Reasons for These are most For computer Systems electronic use a memory for the primary storage and the secondary electromechanical a memory for storage.
The Primary storage has the capacity and Least is the expen¬sive are most; however, it has the fastest access time . The principal primary storage circuit elements are solid -state devices: magnetic cores and semiconductors. For many years magnetic cores were the principal elements used in digital computers for primary storage. The two principal types of semiconductors used for memory are bipolar and metal-oxide semiconductors (MOS). The former is faster, the latter is more commonly used at present. The data CAN the BE Because accessed by randomly, Semiconductor of memories are Referred to as with the random-the access a memory, or the RAM.
There is a wide-range of the secondary storage devices directory. Typical hardware devices are rotating electromechanical devices. Mag¬netic tapes, disks, and drums are the secondary storage hardware most often used in computer systems for sequential processing. Magnetic tape, which was invented by the Germans during World War II for sound recording, is the oldest secondary storage medium in common use. The Data are recorded occurs in the The form of small Magnetized "dots" That CAN the BE arranged to Represent coded patterns of bits.
The Tape devices directory range from large-capacity, the high-the data-rate The units USED with large the data processing support Systems to cassettes and cartridges USED with small systems. Magnetic disk storage, introduced in the early 1960s, has replaced magnetic tape as the main method of secondary storage. As contrasted with magnetic tapes, magnetic discs can perform both sequential and random pro¬cessing. They are classified as moving-head, fixed-head, or com¬bination moving-head and fixed-head devices. Magnetic discs are the predominant secondary storage media . They include flexible, or floppy discs, called diskettes. The "floppies" were introduced by IBM in 1972 and are still a popular storage me¬dium to meet the demands of the microcomputer market.

Результаты (английский) 3:

text 2. STORAGE DEVICESstorage media are classified as primary storage and secondary storage on the basis of combinations "of cost, capacity, and ac¬cess time. the cost of storage devices is expressed as the cost per bit of data stored. the most common units of cost are farmers, millicents (0.001 cents) and microcents (0.000001 cents). the time required for the computer to locate and transfer data to and from a storage medium is called the access time for that medi¬um. capacities range from a few hundred bytes of primary storage for very small computers to many billions of bytes of archival storage for very large computer systems.memories may be classified as electronic or electromechanical. electronic memories have no moving mechanical parts, and data can be transferred into and out of them at very high speeds. Electromechanical memories depend upon moving mechanical parts for their operation, such as mechanisms for rotating magnetic tapes and disks. the data access time is longer than is that of electronic memories; however, they cost less per bit stored and have larger capacities for data storage. for these reasons most computer systems use electronic memory for the storage and electromechanical memory for secondary storage.primary storage has the least capacity and is the most expen¬sive; however, it has the fastest access time. the principal primary storage circuit elements are solid state devices: magnetic cores and semiconductors. for many years magnetic cores were the principal elements used in digital computers for primary storage. the two principal types of semiconductors used for memory are bipolar and metal - oxide semiconductors (mos). the former is faster, the latter is more commonly used at present. because data can be accessed randomly, semiconductor memories are referred to as random - access memory, or ram.there is a wide range of secondary storage devices. typical hardware devices are rotating electromechanical devices. Mag¬netic tapes, disks, and drums are the secondary storage hardware is often used in computer systems for sequential processing. magnetic tape, which was remarkable by the germans during world war ii for sound recording, is the oldest secondary storage medium in common use. data are recorded in the form of small magnetized "disabilities" that can be arranged to represent coded patterns of bits.tape devices range from large - capacity, high data rate units used with large data processing systems to cassettes and cartridges used in small systems. magnetic disk storage, introduced in the early 1960s, has replaced magnetic tape as the main method of secondary storage. as contrasted with magnetic tapes, magnetic discs can perform both sequential and random pro¬cessing. they are classified as moving head, fixed head, or com¬bination moving head and fixed head devices. the magnetic discs are the upon secondary storage media. they include flexible or floppy discs, and diskettes. the "floppies" was introduced by ibm in 1972 and are still a popular storage me¬dium to meet the demands of the microcomputer market.