Here are links to a great selection of some of the best free hard disk, SSD and system utilities you can find anywhere on the web. Also see this page for disk and system tools that are native to Windows.
Solid State Drive Utilities
Tools for older generation SSDs or OSs (XP, Vista) that do not support TRIM command.
SSD Tweaker
Optimize settings in Windows 2K, XP, Vista and 7 for SSD Drives
Secure Erase SSD
a DOS-based utility that securely erases "sanitizes" all data on drives in PCs. Use this to completely clean everything from your SSD.
Free Space Cleaner
Clean up and securely erase the free space on your SSD.
Utimate Boot CD
This download contains over 100 utilities and diagnostics to help you recover from disaster or simply check for problems associated with your cpu, memory and hard drive.
Windows Automated Installation Kit
Designed to help ITs deploy Vista across networks, it also contains ImageX, an excellent utility that can backup a Windows installation. Also works with XP SP2 with KB926044.
PING Hard Drive Clone/Image Utility
Backup and restore partitions to a local hard drive or to the network. Download and burn the ".iso" file to a bootable cd.
Gparted Partition Manager
The GParted application is the GNOME partition editor for creating, reorganizing, and deleting disk partitions. For Windows it must be run from a bootable cd or thumb drive.
DBAN Secure Hard Disk Wiper
Darik's Boot and Nuke download creates a self-contained boot disk that can automatically and securely delete the contents of any hard disk that it can detect.
File/Data Utilities
Recuva File Recovery Utility
Recuva recovers files deleted from your Windows computer, Recycle Bin, digital camera card, or MP3 player.
Eraser Secure File Deletion Utility
Eraser is an advanced security tool for Windows which allows you to completely remove sensitive data from your hard drive by overwriting it several times with carefully selected patterns.
GFI Backup Home Edition Data Backup Software
Backing up your files is a must to minimize the risk of loss. With GFI Backup™ - Home Edition, you need not worry if your hard disk fails or a virus wipes out your data.
Comodo Backup
Reliably copies your files to a safe place and keeps track of all changes to those files.
IoBit Advanced Systemcare Free
A nice selection of tools to help protect, repair, clean, and optimize your PC. This award-winning free registry cleaner and system optimizer is a "must-have" tool to speed up your slow computer.
CCleaner System Optimizer
A system optimization, privacy and cleaning tool. It removes unused files from your system and cleans the registry, allowing Windows to run faster and freeing up valuable hard disk space.
Defraggler
Use Defraggler to defrag your entire hard drive, or individual files - unique in the industry. This compact and portable Windows application supports NTFS and FAT32 file systems.
Auslogics Disk Defrag
A compact and very fast defragmenter that supports both FAT 16/32, and NTFS file systems.
System Security Utilities
Microsoft Security Essentials Virus/Spyware Protection
Microsoft Security Essentials provides real-time protection for your home PC that guards against viruses, spyware, and other malicious software. You must have a legitimate XP, Vista or Win7 installation. Great free software.
Avira Antivir Personal Basic Virus/Spyware Protection
Protects your computer against dangerous viruses, worms, Trojans and costly dialers. Now with basic Anti-Spyware. Excellent detection rates but no real-time email protection.
Spybot Search & Destroy Spyware/Adware Remover
Excellent detection and removal tool that must be run manually - but it's worth doing it. Can be installed alongside other security software.
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disk-restore.com
disk-restore.com
Software and tips to restore hard drives and recover data from fixed and removable disks.