I had 20 GB hdd installed running Windows XP and then the 80 GB drive was added. Then i used Disk Manager available in Computer Management to partition the new hard disk. I wanted to use my 20 GB hdd for another computer, so I removed it and made the 80 GB hard disk as primary master. Now when I try to install the opterating system from the bootable cd, it shows "Dynamic Disk" and does not show any partition or drive letter on the 80 GB disk and it shows zero free space. How can I convert the Dynamic Disk into a Basic disk? If it is not necessary, then what should be done to install the operating system on the dynamic disk without disturbing my partitions and data?