Well, just in other case(if you stored there something else than stolen music/videos/whatever you have there now).
CD can be stolen(or "kindly" asked to be given).
+ If someone tries to copy the data off it while its connected, unmount/kill power.
I suppose you also written a script knowing when someone COPIES not QUERIES the contents of a drive. Please, share it then! =) I was looking for this one for a long time.
Apache has access? Anyone has access then. Encryption is usually meant for something that is for eye-reading only, some passwords, confidential documents, etc that is transferred by-hand and irregularly.
Also this is all partially remains in RAM/swap: how is that safe? It's safe when your entire system works in encrypted environment. Or it is said it's safe because safe is when the power cord disconnected
Don't abuse your CPU/RAM/hw resources for nothing and forum members time, unless you have a reason. Storing pirated music is not really a reason to post in Security.