So I noticed with 4.1 that VirtualBox added a "Solid-State Drive" option in the storage section.
I also know that Win7 will report free space differently for a solid state disk so that the disk can re-use those sectors in it's built-in optimization.
I'm wondering about turning this on even though my host has a spinning disk. Would this effectively zero free space so that I can compact my virtual disk? Would I take a big performance hit by turning this on?