By elimination, I discovered it was an extension used by Digidesign's ProTools 5. Funny thing is, ProTools is used by half the music recording world - and they all need fast drives. I'd be curious to know if Thad Brown has experienced this problem. I'd like to just say, this drive works like a charm. Full CDs can be burnt in 7 minutes.
Audio extraction is extremely fast as well.
I've borrowed one of these drives to hook up to my own iMac DV SE and have burnt numerous CDs with no hiccups. Lucian Fong wrote that MetaBox is going to offer their G4 CPU upgrade with up to 2MB of backside cache. That article shows results of tests in Photoshop 5.5 and other apps and benchmarks. Sometimes happening straight away, sometimes after several hours. No error messages.