Does SoftPerfect RamDisk use differential writing?

Does soft perfect use differential writing? Does it work by writing just the changes, or writing files that have changes? It makes a difference with very large files. And if so, would having the write at 1 minute increments actually not write very much?

I had a different ramdisk previously, and the write at shutdown failed. Does it work correctly on windows 8?

Thank you for your time and responses

Differential write was added in 3.3
I'd assume it's done per modified memory block rather than file basis.

That's really cool. Most ramdisk are not nearly that awesome.
Thanks for the response