Контрольная работа №2.

1. Прочитайте текс и ответьте на вопросы

A NEW TAPE STORAGE SYSTEM

TapeStore is a new kind of tape storage system which can store up to 6,000 computer tapes. No other tape storage system can hold as many computer tapes as TapeStore. The tapes look exactly like video cassettes. Many hundreds of data files can be stored on each tape, up to a maximum of 500 million bytes of data. If you stored the same amount of information on paper, you would need nearly 4.5 billion printed pages.

The machine is a tall black box with a mechanical arm. The machine is 2.5 metres high and 3.0 metres wide. This is how it works. Each tape has a code printed on it. You feed the code number into TapeStore, which then looks for the code. As soon as TapeStore locates the code, the arm reaches in and pulls out the tape.

The system is very fast. It takes the mechanical arm about 10 seconds to find the tape it is looking for. The machine then searches the tape to extract the required file, and this takes less than a minute. A human technician would have to locate and remove the tape by hand, and could take at least an hour to find the right file on the tape.

Some of the world's biggest companies, including banks, insurance companies, airlines, telephone companies, utilities and computer centres, have bought the system. They like it particularly because the system guarantees the security of their data.

TapeStore was originally developed in Canada and is now being marketed world­wide. In Europe alone, 750 have already been installed at a cost of 480,000 dollars each.

Выберите правильные ответы (A, B, C)

1. TapeStore is better than similar storage systems because A it can also take video cassettes.

В it is much smaller.

С it holds more information.

2. The mechanical arm finds the tape by

A recording information on the tape.

В identifying the printed code on the tape.

С looking for the file.

3. The TapeStore system is popular with big companies because

A it costs less than a human operative.

В the information it stores is valuable.

С they know that their data is safe.

4. According to the text, the main advantage of TapeStore over a human operator is that TapeStore

A is re reliable.

В is much faster.

С is very secure

Выберите правильную букву для ответов на вопросы.

5. The number of bytes of information that TapeStore can store. D

1. The number of pages you would need to store the same data as TapeStore. A

2. The time it takes TapeStore to extract a file from a tape. H

3. The number of TapeStore machines installed so far in Europe. G

A	4.5 billion	E	an hour
В	480,000	F	6,000
С	10 seconds	G	750
D	500 million	H	less than a minute