[CentOS] Problem with raid0

Hey! I have big problem with my centos 5.1. I have two hard discs 500gig and 40gig and those are in RAID0. I would like to remowe the small 40gig hd and put new 500gig hd and i don't wan't raid0 anymore. 

How can i copy data from 40gig hd to 500gig hd and switch 40gig hd to new 500gig hd? 

Another question: Can i just copy all my files to windows laptop and if i wan't "backup" files?

Please answer my talent in linux isn't very good. 


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