Sony VGCRB40 ユーザーズマニュアル

The following types of DVD media are not compatible for recording with your DVD±RW drive: 



DVD-R for Authoring 



DVD-RAM 



DVD-ROM 



DVD-R DL (Double layer DVD-R) 

  

 Media compatibility with different equipment varies between manufacturers. If you experience difficulty with recording

data or playing a disc, try a different disc or a different brand of media.