Are these correct?
It looks fine to me. But why ask here on the forum? Isn't it quicker to test the shortcuts by simply double-clicking them? By the way, have you noticed that the MyDefrag script chooser will remember the disks you selected for each script?
Additionally do I understand correctly that "SystemDisk" is only run on C: ?
And "DataDisk" would only be run, in my case on the B: drive?
No. The scripts are intended for the indicated disks, but will run for any disk you like.