Large Drive Tools is a must have for everyone who uses a computer. It does NOT require your system to be up and running to work--it boots directly from a diskette or bootable CD-ROM so you can use it even if your computer won't boot. Here are just a few of its features: Repairs Master Boot Record, Repairs Boot Sectors, Securely erases an entire drive (eliminates your personal data if selling or throwing an old drive out!), Scans an entire drive for media defects, has a full featured hex editor and search tool.