Sony VGN-TX850P - Manual (Page 172)

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Troubleshooting
What should I do if I cannot write data to DVD-RAM media using Windows functions?
This Q & A entry applies to selected models only. See the online Specifications to find the type of your optical disc drive,
and then Reading and Writing CDs and DVDs
(page 34) to find about the supported disc media.
Follow these steps to change the settings:
1 Click Start and then My Computer.
2 Right-click the optical disc drive icon and select Properties.
3 Click the Recording tab.
4 Click to cancel the Enable CD recording on this drive check box.
5 Click OK.
!
Canceling the Enable CD recording on this drive check box disables writing data to CD-R and CD-RW discs. To write data to such discs, make sure to
select this check box.
You cannot add data to DVD-RAM discs with data already written by the Roxio DigitalMedia software due to difference in disc formatting. Attempt to
add data to such a disc will re-format the disc, resulting in loss of the entire written data.