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You could do either easily. I use the Acronis TIH clone disk tool to transfer data to new drives - raid or not.
Also you may find this info helpful.
After reading the "Intel Matrix Storage Manager 8.x" manual. http://www.intel.com/support/chipsets/imsm/sb/CS-020670.htm
I desided to try what I read in section 2.8 on page 12 of that manual. It stated that a RAID 0 or 1 can be migrated to a RAID 5. There is a link to a support page in that section.http://support.intel.com/support/chipsets/imsm/sb/CS-020674.htm The page titled "What types of RAID migration are supported" has a nice chart to find your own setup and chipset. At the bottom is a few more links. In the "related topics" section click on "What is a RAID migration ?" This takes you to a summery page with a repete of info like section 2.8 mentioned above. NOW how do you do this migration from RAID 0 or 1 to RAID 5? In the area of "Related topics" select "How do I setup a RAID-ready setup?" http://www.intel.com/support/chipsets/imsm/sb/CS-022830.htm
Just follow these steps (note: windows 7 users do not need the f6 setup) All of the instructions and downloads you need are there.
My Computer: I started with a 250 gig and a 200 gig HDs, RAID 0 setup. total space on RAID drive = 2x the smaller drive 400 gig. I needed more space so I found a good deal on 2- 600gig HD's After installing the "intel rapid storage technology" software (per instructions on this RAID-Ready setup page) I shut down my computer then installed the 2 new HD's then rebooted. From windows 7 I ran the Intel Rapid Storage Technology software. Migrating took a few hours but know I can remove a HD and install a bigger one and have automatic data protection.