Disk Redactor
Disk Redactor is WIPE utility, that prevent restoration of the old ( deleted ) files at your disks. All free space at your hard disk will be wiped from an old information. This is necessary because the delete function does not clear the space where deleted file is located and just mark the entry... Old information will be available until the other file will overwrite it ( will use the same space at the disk ). ... But actually all information about the file is presented at the disk and can be restored!
http://www.cezeo.com/downloads/disk-redactor.exe - 361Kb - Download - Screenshot

Space Searcher
As our life races ahead with blazing speed, our computing demands grow correspondingly. Can you imagine that several years ago a 40 Mb hard drive was more than enough for holding all data in an average company? The technology evolution brings new demands and the 'massive 20 Gb hard drive' we... Space Searcher allows you visually manage your hard drive space by letting you know which files and folders take too much space on your hard drive. ... Space Searcher is capable of running disk space usage analysis both on small home systems and on enterprise networks.
http://www.coolutils.com/download/SpaceSearcher.exe - 1Mb - Download - Screenshot

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. It helps you explore your files and folders, find wasted space and useless items, and free up valuable disk space. ... diskSpace Explorer can also save or print detailed disk space reports and take graphical snapshots of your hard disk contents. ... You can increase your available disk space by compressing folders, by reducing the wasted space or by deleting the folders you no longer need.
http://www.innovatools.com/download/spexHomeTrial.exe - 1Mb - Download - Screenshot

VisDir Free Disk Space Finder
This free user-friendly utility helps you visualize which programs on your hard drive are using too much disk space. It creates a navigable pie-chart visualization of the space utilization on your computer. This utility is a great helper for when you get one of those messages from windows... This program will help you determine which programs are using too much space. ... Works on windows 95/98/ME/NT/2000/XP. ... This software is freeware with no expiration, no disabled features, no spyware, no adware, and no gimmicks whatsoever.
http://www.sb-software.com/visdir/visdir14.exe - 708Kb - Download - Screenshot

Disk Watchman
Disk Watchman is an application that monitors your hard, removable and mapped network drive resources. It displays free and used disk space on real-time basis. You will be able to see and/or notified by E-mail/ICQ/SMS/sound when your free disk space falls short certain values. ... You will be able to free up more space effectively with its intuitive and fast user interface. ... DW contains rapid tools to find disk space reserves (backup, temporary and duplicated files). ... DW provides a simple and comfortable user interface, easy to understand setup and full control over the visualization...
http://dl.filekicker.com/send/file/167687-RCMO/dwsetup.exe - 1Mb - Download - Screenshot

Advanced Disk Cleaner
Every day the programs on your computer create temporary and garbage files and leave them behind on your hard disk. These files build up over time, taking up valuable hard disk space and slowing your system down. Advanced Disk Cleaner is a free program which makes it easy to quickly find and... After using Advanced Disk Cleaner you will have more disk space at your disposal so you can install more programs, have more MP3 music files, etc. ... The program's main window is designed for a logical, effective and pleasant operation, making Advanced Disk Cleaner a good choice for keeping your PC...
http://innofiles.com/soft/cleaner/advanced_disk_cleaner.exe - 1Mb - Download - Screenshot

CleanDisk
Keep your hard disk free from unwanted junk files There exists many kinds of 'temporary' files that all have in common that they steadily increase in number and thus slowly eat up your hard disk space. Some programs use temporary files to hold intermediate data but do not delete them after... The problem is that if you don't clean up such files periodically, your free disk space will slowly but steadily shrink and it will be more difficult to find the files that you do want because of all the junk littering it.
http://www.fmjsoft.com/download/cdisk28.zip - 481Kb - Download - Screenshot

Disk Password Protection
Disk Password Protection 4. 7: a comprehensive suite of hard-drive protection/access restriction tools. Protect your disk/partitions with a password, ban all reading/writing activity, limit launch of specified files to authorized personnel only, etc. ... When protection is activated, the partition will be invisible to the operating system and the disk space taken up by sensitive data will appear as free disk space. ... The Low-Level Protection option allows users to blocks all attempts to read/write to/from the protected disk.
http://www.exlade.com/download/diskppsetup.zip - 2Mb - Download - Screenshot

C-Privacy
CPrivacy is an advanced privacy management software. It can not only erase all the evidences of use from your PC, it frees hard disk space and improving PC performance, it prevents home page hijacking, has an advanced POPUP blocker and trial is FREE.
http://c-privacy.com/downloads/setup.exe - 6Mb - Download - Screenshot

Compress (adware)
Compress will compress document files up to 99% and delete unneeded files (such as temp files). When the file is compressed, it will still launch with the same view it launched with before it was compressed. Compress is a simple and powerful solution to help you save valued hard disk space! ... Saving disk space has never been this easy! ... The Compress Hound will scout out files that can be deleted and/or compressed, saving even more disk space! ... Compress is adware, and therefore free! ... Its speed out standing and its compression ratio is amazing.
http://www.roadside-software.com/c.../dl.cgi?afi=pad&fn=CompressAW.exe - 1Mb - Download