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This tip explains how to save files almost double the size of the drive physical available size by just compressing the folders in a drive.
NOTE: It is not advisable to compress the C drive as it is where all the system properties and the files reside and compression may degrade the speed of the PC.
Instructions: Right-click on the folder to which you want to compress. Go to the properties, in the general tab, click on the Advanced button. You will get a pop up window of Advanced Attributes. Check on the Compress contents to save disk space in the Compress or Encrypt attributes and click OK.
You will now return to the properties window of the folder. Now click on Apply. In the Confirm Attribute Changes window, click on Apply changes to this folder, subfolders and files radio button and click Ok.
Now you can compress the folders in the drive separately or you can compress the drive itself by checking on the Compress drive to save disk space on the Drive properties.