Greetz all, I have two 1.5 TB drives in a RAID 1 (mirror) array, set up through the Disk Utility. I don't care about performance. These drives store my photos and videos that are still being processed; I keep copies of the final versions on the RAID and on other external drives. The point of the RAID is to guard against losing anything "in progress" before I get around to copying it to other drives. At this point, less than six months in with the array (and fairly light usage), I've had to build the array three times. I unmount the drives properly and have no idea why the RAID seems to degrade so frequently. Oddly, one time Mac OS X reported that the array was degraded, but after dismounting the drives, shutting them off, and then turning them back on in reverse order, it reported that the RAID was healthy. It's strange, it doesn't lend much confidence to the robustness of the RAID (in my opinion), and I'm getting sick of losing time on the rebuilds. I'm curious: does anyone have any theories as to why the RAID is degrading? I'm also curious if anyone has any better suggestions. I could run the drives separately and use some sort of synchronization software, I suppose, but I'm unfamiliar with any such software, nor do I know what the limitations would be. I presume that they don't synchronize as quickly as you would get with a RAID, and perhaps they would take more resources...? Any thoughts, suggestions, commiserations, etc. are welcome.