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Not sure. I know that in order for a RAID array to exist, all disks in that array must be present whenever the system is running.
What I don't know is whether you can remove a disk (after shutdown), take it to another machine, add/remove data, reinsert it into the array and expect the RAID setup to take care of everything next time you power on.Might be worth trying with a couple of USB sticks for a laugh.
Would the "RAIDed" USB-Sticks still work as regualar USB Sticks on other machines?