IPSpaceMon 

SpaceMon makes it easy to watch network storage space and alert you from your current network monitoring package* or simply rely on notification email sent by SpaceMon when a resource dips below the amount of free space you specify.
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DiskCheckup 

Diskcheckup displays the current values of each drives SMART attributes and thresholds. A warning is issued if TEC (Threshold exceeding Condition) is detected.
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VolID(Disk Drives Serial Modifier) 

With VolID you can modify your disk drive's serial number which is also called Volume ID (not hard disk's physical serial which you can find at back of your hard disk) , the format of volume ID is: XXXX-XXXX (X maybe 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F).
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diskSpace Explorer Home Edition 

diskSpace Explorer 3 Home Edition is a software tool for managing your hard disk space, and ensuring that you are making the most of the space you have. The program shows a graphical display of your hard disk and can help you free up valuable space.
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Active Backup Expert 

An easily mastered tool maintains backups of files in the zip or cab format on hard and removable disks, in a LAN or WAN. Use import and export features to synchronize folders on two PCs. Other features include support for Command-line, SFX-backups.
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FileGhost 

Security tool used to protect your files, folders or even whole volumes in various ways. You will be able to lock, hide, deny file reading and writing, prevent deleting, copying, moving. FileGhost is excellent supplement to antivirus and firewalls.
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