What is the model of the Mac you are trying to use this drive on? If it is one of the ones listed here - http://eshop.macsales.com/Descriptions/apldwu10p5.html you shouldn't need a driver for the drive to be recognized. Is this a newly installed drive or one that has worked in the past but suddenly stopped working? I searched the Sony site but could not find that particular model.
What is the model of the Mac you are trying to use this drive on? If it is one of the ones listed here - http://eshop.macsales.com/Descriptions/apldwu10p5.html you shouldn't need a driver for the drive to be recognized. Is this a newly installed drive or one that has worked in the past but suddenly stopped working? I searched the Sony site but could not find that particular model.