Unfortunately, the workaround only works for a limit period of time.
After some time, the problem reappears.
I attach an excerpt of my /var/log/messages. It starts with an
unrecognized drive ("VFS" error messages). At 21:59:21, I do the
workaround (sudo rmmod pata_via ; sudo modprobe pata_via) and the drive
begins to work again... until 22:17:41, when I got an error message from
udisk-daemon, following with a call trace, then a fault from hald-addon-
st (with a call trace), then a fault from VirtualBox (and a call
trace)... and finally the ata5 stops working around 22:20:55.
Then I do the workaround one more time (sudo rmmod pata_via ; sudo
modprobe pata_via) and now I have again a functional drive... attached
as ata7 instead of ata5, don't know why.
** Attachment added: "/var/log/messages"
http://launchpadlibrarian.net/44625793/messages
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Kernel doesn't detect media in CD/DVD drives
https://bugs.launchpad.net/bugs/544548
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