On many newer systems /tmp is a tmpfs not real storage and has limited space (Fedora defaults to 4GB). There's probably several options to work around this but a couple are: 1. Test if /var/tmp exists and use it if it does. 2. Test if /tmp is tmpfs and use somewhere else if it is.
You can select temporary folder in the preferences.
Fedora did this: https://src.fedoraproject.org/rpms/xfburn/blob/master/f/xfburn-0.5.4-tmpdir.patch
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