![]() ![]() ![]() On system drive increasing the file size and cleaning the slack space works on every file, but decreasing the file size back to original size fails on files which are special protected by Windows. Then US can make the secure deletions of the bytes in the slack space of the files and finally reduce the file size to original file. The problem with Clean File Slack Space on system drive is that UltraSentry must increase every file on disk so that all clusters used by the file are completely occupied by the file. On system drive you should use first Windows disk cleanup tool and delete among the temporary files also the shadow copies and older system restore points, next use the Windows defragmentation tool, next use again Windows disk cleanup tool to delete shadow copies created on defragmentation (only Windows 8 / 7 / Vista) and finally use UltraSentry to Wipe Unused Disk Space (not available in US v13.00) which can be safely used also on system drive. ![]() The system drive is the drive which contains the Windows directory. You can run UltraSentry either with an account which belongs to the administrator group or on Windows 8 / 7 / Vista you start UltraSentry with right clicking on the shortcut and choose "Run As Administrator".ĪTTENTION: Don't use Clean File Slack Space on the system drive.
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