Your DVD writer should come with a programme that enables use of DVD RW.
The prog detects when a DVD RW is inserted.
This usually resides as an icon on the bar bottom right of your screen.
If it is similar to mine, when you right click on the icon it will give you a format opportunity.
This same programme is also the one that mounts and dismounts the DVD RW.
Am not familiar with Magic Movies.
Regards Brian j