To my knowledge, the replacement you made is without any downside and has a substantial upside should you acquire a Superdrive controller. Considering how plentiful the Sony 2MB drives are on the Mac "scrap" market, I recommend this drive swap--particularly for those who have a Superdrive controller card! -michael Email: mjmahon@aol.com Home page: http://members.aol.com/MJMahon/