Disk mirroring on W2K Server

My W2K server was installed on a “basic” disk volume and at the time my second disk was inoperable–after repairing the second disk I discovered that W2K want 2 “dynamic” disks in order to create a mirror set–I converted the 2nd disk to dynamic with no problem, but of course there was nothing to lose on it–since this system runs my PBX I can’t afford to lose any availability of this guy:: Can I convert Disk 0 to a dynamic volume without losing any apps, data, or taking the system off line??