Can a basic boot disk be converted to dynamic and then spanned?

Is it possible to create spanned dynamic disks when one is the boot disk? I am getting conflicting info.
I have two 120GB SSDs and one is the boot drive and it is at 92% capacity, while the other is empty.
Problem is the empty is a dynamic and the boot is a basic. I have read that a boot disk cannot be spanned and to compound the problem I have to convert it first to a dynamic disk. I am running Win 7 Pro 64 bit. Is it better to just by a bigger drive?

A spanned volume cannot be used for either the boot or system volumes. They can only be used for a data volume. The problem is that a spanned volume cannot be accessed until the drivers are loaded and the drivers cannot be loaded until the volume is accessible. For that reason Windows won't allow it.