How can I see my external drive again after installing mavericks?

Hi,
I just upgraded my Mac Book Air to Mavericks and I cannot see my external hard drives any more. The data is still there and can be read on other computers. Regular USB keys are also detected.
What should be done so that the external hard drive become "visible" again with Mavericks?
Thank you very much and regards,

Hi Niel,
Unfortunately, the box was already checked. I tried to "uncheck" and "check it again", but it still does not work.
What else can be done?
Thank you very much and regards,

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