Certainly Data Lifeguard Tools 11.2 is an essential tool because although the user is always worried about the content of software installed in the PC (virus, spyware, etc) you shouldn`t ignore the health of your hard drive, physically, because that`s where all your information is stored.
It is a collection of tools related to your hard drive, with which you can make exhaustive and periodic checks and analyses looking for damaged sectors which it will try to repair.
It also lets you do formatting (both normal and low level) and disc partitions, BIOS checks, how many hard drives are connected, and their characteristics, and even a tool called ATA-66 Management that lets you connect/disconnect the support to your hard drives as you wish.