Any one run into this problem and fixed it ?

I'm saving to a WD external 250gb 8mb cache, (maybe this is the problem.)

I'm trying to overwrite to save a song on DP4.5 and an error comes up asking to save the file in a different folder or re-naming file. I've done this and then when trying to save again (overwrite), the same error comes up again. Really a HASSEL, I don't want to keep saving in different locations or renaming the file over and over.

thoughts?
stevep