When Windows Disk Protection is turned on, all changes to the hard disk and program files are cleared and the cache file is emptied at the specified interval you set. As users use the computer, the cache file fills with all changes to the operating system and program files. If the cache file fills to 70 percent capacity, the user will receive a warning message.
Windows Disk Protection created the cache file at 50 percent of the free disk space (up to 40 GB) to give shared users plenty of disk space to use. However, if the warning appears, you can clear the cache manually.
To clear the cache
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Have the shared user save files to a removable storage device (if possible) and log off of the computer.
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Log on as an administrator.
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Open Windows SteadyState.
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Click Protect the Hard Disk.
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Ensure that the Remove all changes at restart option is the selected.
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Restart the computer.
The cache file is now cleared.