When you format a volume with NTFS, Windows 7 allows you to turn on compression for the entire disk. With compression enabled, any files created on or moved to the disk are compressed automatically. When you open files or access folders, Windows 7 expands the files or folders for viewing as well. This behind-the-scenes compression and expansion makes NTFS compression completely transparent, but it does use some of your computer's processing power. With that said, there's an enormous benefit: you can store much more information on a compressed drive.
* > I You cannot compress encrypted data. If you try to do so, Windows 7 M?' J automatically decrypts the data and then compresses it. Likewise, if you ilv try to encrypt compressed data, Windows 7 expands the data and then encrypts it.
Compressing a drive
You can compress a drive and all its data by completing these steps:
1. In Windows Explorer or Disk Management, right-click the drive that you want to compress and then select Properties.
2. On the General tab, select "Compress drive to save disk space" and then click OK.
3. In the Confirm Attribute Changes dialog box, shown in Figure 19-17, specify whether you want to compress only the top-level folder of the drive or the entire drive:
• To compress only the drive's top-level folder, select "Apply changes to drive X:\ only."
• To compress the drive's top-level folder, subfolders, and files, select "Apply changes to drive X:\, subfolders and files."
Any files or folders you create on a compressed drive are compressed automatically.
Confirm Attribute Changes i~ ^ ~
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