Darik's Boot and Nuke - Self-contained boot floppy that securely wipes the hard disks of most computers. DBAN will automatically and completely delete the contents of any hard disk that it can detect, also prevents or thoroughly hinders all known techniques of hard disk forensic analysis.
Hard Drive Help - Provides information and tips to solve common hard drive problems.
HowStuffWorks: How Hard Disks Work - Takes apart a hard disk to see what's inside, and also discuss how they organise the gigabytes of information they hold in files.
