if you have raid 1 then both drives are identical and can be used independant of one another in this system or any other. removing them will not cause any data loss. if you change teh contents of a drive while its out of raid, when you plug it back into raid then it will need to rebuild the array wich could take a few hours.
what drive is windows not seeing? did one of the drives in the raid fail or is the system not seeing the raid array itself?
Both drives were visible during boot up... Window's 7 all of a sudden just didn't see the array any more.
I think at this point I will just delete the array and leave one drive in the computer and back it up with the other using a docking station. Then I will no longer have to worry about this problem at all. The back up would be off line! There would be additional drive space available on the computer for another hard drive. It may be cumbersome to keep everything in order... But in the long run I would just feel more secure.
Thanks again for all your help