Hi Brian, We're having exactly the same issue, running Win2K3, BE10 and ADIC1000 libraries. One thing I've noticed, is that the library imports the media into a vacant slot, doesn't even READ the media, and then reports it as "retired".
So any CRC errors that may or may not exist have not even been checked before this media is retired. It's happening in 2 different libraries which combined have around 40 different drives to choose from.
A quick erase sometimes works as well. I've spent a good few hours trawling this site trying to find an answer to this. I'll keep an eye on this post, and if I find anything out, I'll put an update here.