Just a word of warning; I have found that Encore will fail 99% of the time mid-point on erasing a re-writable Blu-ray disk, thereby rendering it a coaster! (YES, I am checking the "erase disk" box when this happens!)
The disk is not mountable and cannot be recovered in any way I have found...
If you need to re-use a BD-RE, use another utility like ImgBurn or Nero or Cyberlink Hi-Def Suite to erase or reformat the disk PRIOR to letting Encore anywhere near the disk!
At $40 USD a pop, making coasters gets old REAL quick!
word to the wise...
"The camera is a base instrument; you must do violence to it..." Orson Welles