I only experience this problem with CD-Rs - DVD-R are recognized
correctly.
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Brasero does not recognize audio CD or blank CD-R
https://bugs.launchpad.net/bugs/181703
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I can confirm this bug - all CD-R are recognized having 0 bytes of free space.
Other burning programms like k3b or GnomeBaker are working as normal.
I have not tested yet, whether this bug also affects DVD-burning. Will try that
soon.
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Brasero reporting blank CDR's as having no free space in