Disc won't mount

This is becoming horrible. I have a large iTunes library on a Mac Pro. It's 1.5TB and counting. Lately I have to restart the machine each time I need to get a CD disc on the desktop so that I can import it. After a restart I am fine. But soon, with lots of database info being written and changed, I insert another CD for import and nothing happens. It doesn't show on the desktop. All computer functions seem to be fine. But that disc won't do anything - including eject.
I must restart the computer again! and then the disc will mount, I can open iTunes and import it.
Any suggestions?

I am not all that familiar with the working of iTunes other than what I experience (with an old version and old OS and old computer).
Big files might slow things down under certain conditions.  Say you were renaming 100 ALAC files vs. 100 mp3s.  It will take a lot longer to re-write the bigger files than the smaller ones.  Nevertheless, how noticeable a difference would this be with eSATA?
Just a feeling but I'd check your drive. A year ago I avoided buying a 1TB drive because I just wasn't impressed with the reliability ratings on anything bigger than the 640GB drives I ended up buying instead.
I guess theoretically you could have too much happening with a drive if you were trying to get access to your media files and the library file. That's theoretically. Many people here all have it on USB2 external drives but yours is the first issue I've seen with your details.  Keeping it all on one drive does make it a lot more portable.
No idea if this could be a practical issue, but file fragmentation.  Not usually considered an issue with Macs but since you have a huge drive I again can't help but feel at some stage it may just take longer to collect all the bits and pieces of files.  We may just be talking milliseconds here, and all this doesn't really point to the main issue you were having.

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