Script Download:DisableLowDiskSpaceWarning(PowerShell).zip
http://gallery.technet.microsoft.com/scriptcenter/Script-to-remove-the-low-70240a74

This PowerShell script sample shows how to remove the low disk space warning.

In Windows, when one of your hard drives has less than 200MB of free space. It will continue to warn you at predefined intervals and balloons will remain open for 30 seconds when you have less than 80MB of space. Actually, many users are well aware that you're low on space and don't want to be repeatedly reminded, so this script can turn off the "low disk space" warning easily.

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You can find more All-In-One Script Framework script samples at http://aka.ms/onescriptingallery