Problem solved, see also here:
http://www.mail-archive.com/[email protected]/msg435655.html
So it was my DVD Drive, Firmware update solved the problem
** Changed in: ubuntu
Assignee: (unassigned) => TorbenK (tkuehle)
Status: New => Fix Released
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system freezes while trying to access harddisk
https://bugs.launchpad.net/bugs/147183
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