A quick Note before we continue!
Spanned volumes are not RAID volumes and they are not fault tolerant. If one of the disks in the volume should fail, you lose the data on both disks. That being said, let’s continue…
There are two ways to combine volumes into one: the Disk Management tool or the command line utility. Both methods require you to have Administrative privileges. You should also make a backup of whatever is on the disks before you continue, just to be on the safe side of things. I’ll show you the GUI way.
Disk Management tool
You need at least two dynamic disks in addition to the startup disk to create a spanned volume. All disks can be converted into a dynamic volume using the Disk Management tool. You can extend a spanned volume onto a maximum of 32 dynamic disks. If you haven’t converted your disks to Dynamic Volumes, you will have to erase a drive, making it unallocated – and thereby loosing all data on it.
There are many ways to get access to the Disk Management Tool and everyone has their own favorite. Mine is Right Clicking the Computer Icon and choose Manage. From there I activate the Disk Management Tool. I know there are faster ways, but …
Converting a Volume
To convert a volume from a Basic Volume to a Dynamic one you have to delete the volume first.
- Right Click Volume to convert, Choose DELETE
- Right Click the unallocated volume and choose CONVERT TO DYNAMIC
Repeat steps for all disks you want to convert.
Creating Spanned Volumes
- Right Click one of the dynamic volumes and choose New Spanned Volume,
the New Spanned Volume wizard starts
- Follow the on-screen instructions. When asked add all disks to include in the spanned volume.
- When the span wizard is done, you should be asked to assign a drive letter and format the drive (NTFS is the only choice available).
Now your large spanned volume should be ready to use.
If you would rather use the Diskpart Utility (Command Line Tool) then you can read more about that at Microsoft TechNet.