Прочитайте текст Your computer may have either one or two disk drives which MS-DOS knows as drives A...: ответ на тест 606881 - Английский язык

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Your computer may have either one or two disk drives, which MS-DOS knows as drives A: and B:.
The default drive is the one which MS-DOS uses unless you tell it to do otherwise. It is shown by the prompt which MS-DOS displays:
A>       drive A is the default drive
B>       drive В is the default drive
Tо change the default disk drive, enter the new drive letter:
A>   B:    changes the default drive from A to В
B>   A:    changes the default drive from В to A
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Can the computer have only two disk drives?

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Your computer may have either one or two disk drives, which MS-DOS knows as drives A: and B:.
The default drive is the one which MS-DOS uses unless you tell it to do otherwise. It is shown by the prompt which MS-DOS displays:
A>       drive A is the default drive
B>       drive В is the default drive
Tо change the default disk drive, enter the new drive letter:
A>   B:    changes the default drive from A to В
B>   A:    changes the default drive from В to A
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Can the computer have only two disk drives?

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Computers store information on disks in files. A file is a collection of related information such as a computer program or the text of a letter.
Each file is given a unique name, and each filename is stored in a directory. To find out about the files in a directory, use the MS-DOS command DIR.
When referring to a file, you must use a file specification. This consists of a pathname, a filename and an extension (if there is one). As an example, to reference a file on drive B: called FRED.BAS (where the default drive is ‘A’) the correct file specification would be:
B:\FRED.BAS
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How do you find out about the files?

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MS-DOS lets you organise the files on your disk into directories. Directories are a way of dividing your files into convenient groups. A directory may contain any number of files, but it is often more convenient to separate the files into subdirectories.
This method of organising the disk is rather like a tree where the files are the leaves of the tree and the directories are the branches. (The first directory is usually called the “ROOT”).
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What is the “ROOT”?

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You must tell the computer which directory it is to use as its current working directory - that is, the directory you wish to work in. Do this with the CHANGE DIRECTORY command (CD). The current working directory is often called the default directory.
To change the current directory use CD followed by the pathname of the directory you wish to use. For example:
A>  CD\SUB1\SUB3
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What is the current working directory?

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Under MS-DOS 3.20 you can create and access names for many different types of devices - just as if they are physical disk drives installed in your system. The devices you can access as disks are:
- internal floppy-disk drives
- external floppy-disk drives
- additional drive identifiers for floppy-disk drives, defined by DRIVER.SYS
- hard-disk drives of many different sizes
- RAM disks created in the computer’s memory
- directories that  have  been given logical  drive names using SUBST
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Can you create and access names for all devices in MS-DOS 3.20 system?