From time to time you need a Rescue System - because your system doesn't start any more, you had a head crash and want to save your data or you just want to repartition your disks. I like SystemRescueCD. The documentation is available in English, German, French and Spanish. All file systems are supported and a lot of nice tools are available. In particular there is a shell script which easily allows to install the rescue system on an USB  stick. 300 MB is sufficient But if you want to use the stick also as a data repository the stick should have more memory.
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