SystemRescueCD is a free, Linux-based CDROM image for system recovery that boots into a minimal graphical interface and provides a host of useful tools culled from many sources.
In addition to the suite of dedicated recovery and repair utilities, the disk can get you to a basic desktop that includes network connectivity and a web browser. This is an important feature as, let's face it, most recovery work requires the odd visit to a search engine.
Although it can boot to a fairly useful desktop, it's not a lightweight general purpose distribution like Puppy Linux.
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