Hi! The senseless megapixel race has no end, a photo is now around 25mb big reason my photo archives is rapidly growing as never before. the more disastrous it would be if the only current drive fails now. Therefore creates a RAID1 solution! disks are probably due to the numerous natural disasters currently be quite expensive. Fortunately, I have no idea what HDs have tasted before. Respect so be it! A 500gb 2.5 inch drive I had indeed already but I put my first search out regardless of format.