TechTool Deluxe was a part of the AppleCare Protection Plan for Macintosh computers. It is based on Micromat's powerful TechTool Pro diagnostic and repair utility. TechTool Deluxe checks the major computer components covered under the AppleCare Protection Plan. It is available only by purchasing an AppleCare Protection Plan for a Macintosh.
TechTool Deluxe offers these features:
Repairs Directories by Rebuilding
Volume Repair Preview Report
Bad Block Detection on Drives
Checks the Drive Mechanism
Checks USB Functionality
Checks Video RAM
Even more important than being merely a diagnostic program that tells you what is wrong with your Macintosh, TechTool Deluxe can also repair many of the problems it finds.