Sony VAIO VGCRB40 Owner's Manual page 149

Incompatible DVD media
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.
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