This isn't really a problem so much as a theoretical question. Right now i'm running a thecus n5550 NAS in raid 5. What would happen if i put in another hard drive not with the purpose of running raid. Would that drive be accessible or would the NAS want me to rebuild the RAID to include that new hard drive? A friend of mine needs files pulled from a hard drive and i was curious if i could slip it in, pull the files he wants, then pull the drive after with no negative consequences on my current setup.