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Aside from checking the manual for a particular DVD drive, is there any way to determine if a DVD drive supports DVD +R/-R (DL) for both reading and writing?

In Windows, Nero InfoTool is a convenient way to determine the capabilities of a drive. Is there an equivalent tool (or method) for linux?

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You should be able to use

less /proc/sys/dev/cdrom/info

to display the functionality of the DVD drive. 0 means an option is not enabled and a 1 signifies an option that is available.

If you have libcdio installed you can use the cd-drive command for more detailed drive information.

K3b is a graphical tool you can use that is similar to Nero.

Navigate to:
Settings ==> Configure K3b ==> Devices

This should display the DVD+R status.

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    As for /proc/sys/dev/cdrom/info I see options for "Can read DVD" and "Can write DVD-R" but I don't see any option listed for +R and nothing about dual layer. As for cd-drive command, I see "DVD+R Feature" listed under Core Feature and "DVD+R - DVD Recordable" and "DVD+R Double Layer - DVD Recordable Double Layer - on" under Profile List Feature. Under Reading... only "Can read DVD-ROM" and under Writing... "Can write DVD-R" = Yes, but no specific mention of "Can write DVD+R". Can write DVD-RW and DVD+RW are both No. – user974967 Apr 28 '15 at 22:36
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You can try using cd-drive which is included in Fedora for example in libcdio package. When you run command:

cd-drive

a possible output could be:

Profile List Feature
DVD+R Double Layer - DVD Recordable Double Layer
DVD+R - DVD Recordable
DVD+RW - DVD Rewritable
DVD-R - Double-Layer Sequential Recording
Re-recordable DVD using Sequential Recording
Re-recordable DVD using Restricted Overwrite
Re-writable DVD
Re-recordable DVD using Sequential recording
Read only DVD CD-RW Re-writable Compact Disc capable Write once Compact Disc capable Read only Compact Disc capable
...

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