[all variants] disk partition: /usr, /home and / ; separately -- problem.

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http://ubuntuforums.org – I partitioned my hard disc in such a way that i have logical parts for /usr, /home and /. I have done this , so that in case i want to change my os I need not re install all the application and format my home dir. My doubt is , I forgot that the configuration files are in /etc, and i did not give any logical partition for it. so if I change my os by just formating / , will i be able to run the programs in the /etc? Right now I am using Xubuntu. (Hardware)