I have a Mercury QX4 external RAID from OWC that I bought a few years ago. I set it up as a 4-disk RAID5 and use a RocketRaid esata card for mac that still works fine. Unfortunately I couldn't find the exact model of the QX4, but there's an updated version that's nearly the same. If I buy a new QX4 and put the disks in the same order, will my data be ok since I'm still using the same esata card, or will I risk losing all the data because the hardware RAID5 enclosure models are different?