Use the Disk Management snap-in in Windows XP/2000/2003 to convert a BASIC disk to a dynamic disk.

To do this, follow these steps: 

1. Log on as Administrator or as a member of the Administrators group. 
2. Click Start, and then click Control Panel. 
3. Click Performance and Maintenance, click Administrative Tools, and then double-click Computer Management. You can also right-click My Computer and choose Manage if you have My Computer displayed on your desktop. 
4. In the left pane, click Disk Management. 
5. In the lower-right pane, right-click the basic disk that you WANT to convert, and then click Convert to Dynamic Disk. You must right-click the gray area that contains the disk title on the left side of the Details pane. 
6. Select the check box that is next to the disk that you want to convert (if it is not already selected), and then click OK. 
7. Click Details if you want to view the list of VOLUMES in the disk. Click Convert. 
8. Click Yes when you are prompted to convert the disk, and then click OK. 

Warning: After you convert a basic disk to a dynamic disk, local access to the dynamic disk is limited to Windows XP Professional, Windows 2000 and Windows Server 2003. ADDITIONALLY, after you convert a basic disk to a dynamic disk, the dynamic volumes cannot be changed back to partitions. You must first delete all dynamic volumes on the disk and then convert the dynamic disk back to a basic disk. If you want to keep your data, you must first back up the data or move it to another volume.

Use the Disk Management snap-in in Windows XP/2000/2003 to convert a basic disk to a dynamic disk.

To do this, follow these steps: 

Warning: After you convert a basic disk to a dynamic disk, local access to the dynamic disk is limited to Windows XP Professional, Windows 2000 and Windows Server 2003. Additionally, after you convert a basic disk to a dynamic disk, the dynamic volumes cannot be changed back to partitions. You must first delete all dynamic volumes on the disk and then convert the dynamic disk back to a basic disk. If you want to keep your data, you must first back up the data or move it to another volume.