If you were planning on building a collection of system service tools, there's no reason why you couldn't produce your own maintenance toolkit using a USB stick and a number of key portable applications. Take with you a portable Registry cleanser, a defragmentation tool, a recovery application and so on, and you have your own system toolkit.
Defraggler Portable 1.05 is the version you can install to a USB flash drive or similar, without having to then install it on the host PC in order to use the software to defragment the same host computer.
Defraggler Portable link.
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