I chose "Render to Disk", started it, a prompt to "Save As" came up. OK, I clicked to start. 2 days go by and it finishes. Here's the tricky part, I'm so much in the habit of saving a file when it is done that I didn't realize when I saved the file I Re-wrote 2 days of rendering back to the original 1% - 1 pass file...UGH! So my advice is when you use "Render to Disk" Rename that file because 2 days or even a lot of hours can cause you to forget. This is worse than a "Bryce Fault Error" because it's self inflicted. LOL Hope this helps