problems copying DVD - size is not new calculated after inserting next disc

[LAZA]

~~I copy my DVDs as Backup to hard drive, but this time i got only non-working/corruptiv files.

Original:
http://www.amazon.de/gp/product/B009EQHI60?psc=1&redirect=true&ref_=oh_aui_detailpage_o01_s00

Those disks are about 8.3 GB each, and if i insert them in my drive they work without problems.

They start, if i want to copy them to HDD, showing me the correct size of 8.3 GB.
At the drive, they are about 7,9 GB in Thunar, 7920xxxyyy in GNOME Commander, 7,4 GiB in Nemo

So, clearly, there is a border where Brasero has a problem copying or writing the correct file down.
File system is ext4, if this matters.~~

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Finally i managed to copy one of these DVDs correct and working onto hard drive and did nothing different to the steps before.

Size is now 8,3 GB with Thunar on the hard drive.

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Seems to be a general problem of Brasero:
I have to close and restart it to get the real size of the DVD and finally a working copy. Got four working DVDs now with this method.

.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: brasero 3.10.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.19.0-30.33~14.04.1-generic 3.19.8-ckt6
Uname: Linux 3.19.0-30-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.15
Architecture: amd64
Date: Mon Sep 28 21:08:11 2015
InstallationDate: Installed on 2015-06-25 (95 days ago)
InstallationMedia: Xubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
SourcePackage: brasero
UpgradeStatus: No upgrade log present (probably fresh install)