Mirror Drive

I currently have a W2k Server that the primary Hard drive is 18Gb put is partitioned into 4 smaller drives. The drives are labled under disk manager as “basic”. I just installed another 18GB Hard drive and I want this drive to mirror the primary hard drive. How do I do this without losing any information on the primary drive.

I am concerned that If I change the drive from Basic to Dynmic I could lose information.