Sony VGC-RA810G - Manual (Page 141)

Incompatible DVD media
The following types of DVD media are not compatible 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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