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You have selected free tutorial of the Microsoft Corporation for the Microsoft Technology Associate (MTA) :
98-349: MTA: Windows Operating System Fundamentals : Module 4: Managing Applications, Services, Folders, and Libraries :
Understanding Compression
Microsoft Help:-
Support for advanced backup options such as compression, splitting of a backup into smaller
files, password protection, and others—If you want these or other advanced options, you must
use a third-party backup program.
Windows 7 ships with built-in provisions for file compression that is implemented via NTFS. File
compression works by encoding data to take up less storage space. Digital data is compressed by
finding repeatable patterns of binary 0s and 1s. The more patterns found, the more the data can be
compressed. Text can generally be compressed to approximately 40% of its original size and graphics
files from 20% to 90%. Some files (namely EXE files) compress very little because of the lack of
repeating data patterns within the program. The amount of compression depends entirely on the
type of file and compression algorithm used.
Compressing a file or folder in Windows is a simple process:
- Open Windows Explorer and select the file or folder you want to compress.
- Right-click and select Properties from the context menu.
- Click the Advanced button at the bottom of the Properties dialog box.
- In the Advanced Attributes dialog box that appears, check the Compress Contents to Save Disk
Space box .
- Click OK, and you are prompted to choose whether you want to compress files and folders
Two caveats are in order with compression:
- A file or folder can be compressed or encrypted, but not
both. These options are mutually exclusive.
- By default, compressed files are shown in blue and
encrypted files are shown in green. If you choose Control
Panel, Folder Options and select the View tab, you can find
an option to display compressed and encrypted files or
folders in an alternate color.
Use compression only when expressly needed. Compression
causes significant performance reduction if a sizeable number
of commonly accessed files are compressed, due to the CPU
processing required to decompress them for use.
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