I use a 'Portable' install (on a 14G USB 2.5"HD) for my main Library, but use the Regular Calibre (32 or 64) to access it.
All you usually have to do is copy the configuration folder (calibre settings on Portable) contents
If yo are using Flash Media, beware that it has a 'usable lifecycle' and should be replaced at the first sign of data type(bad block) errors
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