I've just bought TDK 880N and has found it to be really NEC 2500A clone. I've downloaded TDK FW from this drive and it's version 1.31. I don't know how thiss number is related to original NEC FW but it looks so similar (when you look at it in hex mode) that I think TDK drive is really 100% compatible with NEC. But I'm afraid to install original NEC FW in my lovely new drive. So ust to inform all of you about this fact.