Assume that you have a computer that has one or more dynamic volumes. You install Windows 8 over an earlier version of Windows on the computer, for example over Windows 7 Ultimate. In this situation, the data on the dynamic volumes is not available after the installation of Windows 8.
Additionally, if the operating system volume is a dynamic mirrored volume, Windows 8 may not start, the installation may fail, or the computer may roll back to the previously installed operating system.
Note This issue does not occur when you install Windows 8 Pro or Windows 8 Enterprise.
This issue occurs because only Windows 8 Pro and Windows 8 Enterprise support dynamic volumes among all the Windows 8 editions.
Before you install Windows 8 on a computer that has dynamic volumes, make sure that you copy the data to a basic volume.
If the issue that is described in the Symptoms section has already occurred, use one of the following methods to recover the data.
Use Windows Recovery Environment (Windows RE)
To start Windows RE, insert the Windows 8 installation disc, and then restart the computer from the DVD. In Windows RE, you can copy data from dynamic volumes. If you use a dynamic mirror volume for the operating system volume, you can break the mirror.
Connect the dynamic disks to a system that supports dynamic volumes
Connect the dynamic disks to a computer that is running one of the following operating systems, and then import the disks: