Per the Microsoft technet, the size of an MSR is 128 MB. But Mircosoft doesn't tell us if the size can be changed.

I have a question, does it still work well if create the MSR Partition with 200MB or 300MB+?

• Edited by JZYPAY Saturday, March 07, 2015 10:11 AM change the title

Yes you can change it and make it as big as you want, just that once created- windows will not mount it by default so you can't see it.