VTech Write It Right Computer Especificações descarregar pdf (Página 32)

Storing Files on a Computer

To learn more about how your computer works, you have to

learn how MS-DOS organizes and stores data.

All

information on disks is stored in

fi1es.

fIle

simply a

collection of information. Computer

fIles

can be broken down

into three categories:

• System Files ... contain MS-DOS information that man-

ages the computer operations.

• Program Files... contain information that lets your

computer perform a series of specific tasks.

• Data Files... contain information which you enter, such

documents created in a word processing package, or

worksheets created with a spreadsheet package (like Lotus

1-2-3).

All

fIles

are referred to by their filename. MS-DOS fIlenames

may not be more than eight characters long. Filenames can

contain letters, numbers, and the symbols

$ & # % ' ( ) -

@ A { } or

To further identify a

file,

a fIlename can contain an extension

of up to three characters. The extension

always

appears at the

end of the of a filename, preceded

a period. Extensions are

a good

way

to categorize

fIles

into efficient groupings. For

example,

fIles

containing Lotus spreadsheets end in the extension

.WKS

- an abbreviation for worksheet, while word processing

documents could end in .DOC - an abbreviation for document.

The following are all valid MS-DOS filenames:

SALESLTR.DOC Checking.bal File#1.TXT

QTR1.WKS

MyFile

WlN.INI

Menu.BAS Work.TST

XXX.xxx

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