I read some confusion information on the forum: There's a thread which says unRAID does not have optical drive drivers and thus will never support passing through There's another thread which says it's possible using "by-id" (which I can see on my rig e.g lrwxrwxrwx 1 root root  9 Apr 22 21:40 ata-PIONEER_BD-RW_BDR-207D -> ../../sr0) but then it refers to XEN, not KVM, I think. Someone also said the only way is to passthrough optical drive is the entire sata controller. Confused.