MCSA/MCSE Self-Paced Training Kit (Exam 70-270): Installing ...

F10us13
Figure 10-13 Compressed folders are labeled with a zipper icon.
Lesson 2 Managing Compression
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How to Compress Files, Folders, or Volumes by Using NTFS
Compression
Unlike compressed folders, NTFS compression is a function of the NTFS file system
and as such is available only on volumes formatted with NTFS. Files compressed with
NTFS compression can be read and written to by any Windows-based or MS-DOS–
based application without first being uncompressed by another program. When an
application or an operating system command requests access to a compressed file,
NTFS automatically uncompresses the file before making it available. When you close
or explicitly save a file, NTFS compresses it again.
Note NTFS allocates disk space based on uncompressed file size. If you copy a compressed
file to an NTFS volume with enough space for the compressed file, but not enough
space for the uncompressed file, you might get an error message stating that there is not
enough disk space for the file, and the file will not be copied to the volume.
How to Compress a Folder or File
You will use Windows Explorer to set the compression state of folders and files. To set
the compression state of a folder or file, right-click the folder or file in Windows
Explorer, click Properties, and then click Advanced. In the Advanced Attributes dialog
box, shown in Figure 10-14, select the Compress Contents To Save Disk Space check
box. Click OK, and then click Apply in the Properties dialog box.