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. ... DW contains rapid tools to find disk space reserves (backup, temporary and duplicated files). ... You will be able to free up more space effectively with its intuitive and fast user interface. ... 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

AEVITA Erase Hard Drive
When you give away your hard drive or sell off your old computer, you are basically "licensing" the third party to access your old e-mail, private customer information, corporate secrets, and other sensitive data. Even if you have deleted all data from your computer's hard disk and reformatted... Once a disk has been erased with AEVITA Erase Hard Drive, no data recovery tools, regardless of their level of sophistication, will be able to recover any data that previously existed on the disk. ... When you delete your data using AEVITA Erase Hard Drive, all traces of the data are removed from...
http://www.aevita.com/ftp/eraseharddrivedemo_setup.exe - 2Mb - 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

Disk Space Inspector
Disk Space Inspector is a feature-packed, yet easy to use, hard disk analysis, file management and disk space reporting software. The application allows for managing and monitoring disk space on local and network computers as well as it allows creation of customizable graphically-rich disk space... - Graphically analyze disk space usage using Pie Chart and Bar Chart tools - Report disk space usage by volume or directory as text files. ... - View disk space usage by owner (NTFS owner) on a selected volume and/or directory to determine who is using the most space on a given volume.
http://www.advexsoft.com/disk_space_inspector/download/dsi_setup.exe - 5Mb - 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 Space Recovery Wizard
With Disk Space Recovery Wizard you could reclaim up to 500MB of wasted space Disk Space Recovery Wizard is the No 1 Garbage and Junk File Cleaning utility. With it's advanced search and clean capability it can find over 71 types of junk files in less than a minute. ... Another important function is the Junk Cluster cleaner which can reclaim hundreds of Megabytes of valuable space from wasted clusters on your hard drives. ... It also includes a cookie cleaner and temp file-cleaning tool. ... With ability to control, which files are to be deleted, this is a very easy to use tool.
http://www.dmisoftware.com/diskwiz.exe - 2Mb - Download - Screenshot

DiskAnalyzer Professional
DiskAnalyzer Professional (formerly MBS Disk Space Analyzer) is a fast, flexible and network-enabled hard disk space analysis and cleaning software. It helps you find out exact disk space utilization and regain your lost disk space. Highlights ----------- Find out oldest files, biggest files,... Apply Various filters on the analysis results to find out exact disk space utilization. ... Generate detailed disk space reports in HTML, XML, CSV and ASCII file formats. ... View disk space utilization by file types (extension), file attributes, file date and time, file size, file ownership.
http://www.craveworldwide.com/mbsdsa.zip - 2Mb - 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! ... 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

Dispexplorer
Hard disk utility that helps you track disk space usage. It uses stylish and unique 3d graphics. Helps you understand where is lost most of disk space. It's unique disk utility that makes your file system more organized. You can zoom in / zoom out unique 3d pie chart that shows each folder as... More info on site. ... Free trial 20 days. ... You can right click and choose context menu. ... Change colors also. ... Gradient bar charts shows size ratio between file / folder and root folder.
http://www.digihumm.com/Files/Dispexplorer.zip - 838Kb - Download - Screenshot