okay, i have two identical drives that i want to set up in a raid 1 (mirror) array. one drive has lots of valuable data on it that i don't want to lose. the other drive is blank with no partitions set that i want the data to be backed up to. if i go into my raid bios and add them to an array, it prompts me with, "all data on new (or added) disks will be overwritten. continue?" and if i choose "yes" then it asks, "clear MBR?". i have hit "no" at that point and it still shows the array as healthy in the raid bios, but windows is unable to install a new device and the drives don't show up in disk management. i really don't want to lose the data on the first disk so will choosing "yes" clear it? or just the blank second disk? i don't have another drive big enough for everything to backup onto. had anyone done this? this on a 7050/630a chipset with the latest chipset drives installed.