1) Well, if I hit Retry the error doesn't appear again (like it's supposed to, it ignores mounted file system drivers) and if I hit Continue the burn goes like normal, but the strange thing is that the error didn't appear until a few weeks ago, after I successfully burned several disks.
2) AIDA64 shows two controllers: Standard AHCI 1.0 Serial ATA Controller and JMicron JMB363 SATA-II RAID Controller.
Thanks in advance, you've done a great job with the program.