Hi, I'm looking at getting an external enclosure (4-bays) and have started to consider an enclosure with RAID. before anyone gets to excited i'm not thinking of raid as a substitute to regular backups. that being said, i've come across the term - Online Capacity Expansion (OCE). i've been checking around and i seem to be getting mixed definitions or maybe they are the same thing but different ways of accomplishing the same thing. could someone please explain to me which one is correct or if the definition covers both explanations. v1. allows expansion of an array through the addition of another disk ie. 3 disk RAID 5 array ---> 4 disk RAID 5 array v2. allows expansion of the array but replacing smaller drives with larger drives ie. 4x500gb RAID 5 array --->4x1tb RAID 5 array it seems like there are a few devices that allow you to do either of these expansions (netgear nv+/nvx has x-raid, promise ns4600 allows for additional drives) . i'm looking for a device that will allow me to expand the individual drives (v2, replace smaller drive with larger drive, allow the RAID to rebuild and repeat with the additional drives). i like this method of expansion the most since it doesn't require moving the data off the array, adding new drives and copying the data back as well as allowing you to replace drives as they become bigger and cheaper. i'm beginning to think this feature is more for the higher end RAID devices but i can always dream. on that note the best alternative that i've read about seems to be the OWC Mercury Elite-AL Pro Qx2. i emailed tech and they said i have to copy all the data off the array, replace drives and move data back for their RAID. downside is you have to have all your drives and a large enough backup drive to move the data onto but it has a quad interface which is nice and for the price seems pretty good any other suggestions are welcome. oh, and by the way i have a mini that will be acting as a "server" so i want to avoid media servers to avoid to much redundancy. a solid enclosure with a boat load of options is all i want, does that sound like to much to ask?!?! thanks!