Hi folks, I just got my SP3 and a Transcend microSDXC. I followed the PART I of this tutorial (https://stltechtalk.com/ultimate-ms-surface-hack-fully-utilize-micro-sd-card/#.) and mounted it as a permanent driver. Now I want to dismount it, but the disk management keep jump out a warning says "Access is denied" as in attached picture. Does anyone knows how to fix this problem?