Hi there! yesterday I installed Mavericks on my Macbook. Since then, it doesn't mount my external hard disk drive anymore, which he did a week ago (without the update). Is there anyone out there who knows a solution?

Hi there! Yesterday, I installed Mavericks on my Macbook. Since then, it doesn't recognize my external hard disk drive anymore (at least not on the desktop. In Germany they call it "it doens't mount it". I don't know if it's the same expression in english?)
I just used it a week ago, before I did the update and it worked perfectly fine.
Is there anyone out there who knows a solution for this problem? I've been googleing for hours now and can't find any answer.
Thank you!!!

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a Fusion Drive or a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
The login screen appears even if you usually login automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of the test.

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