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There is a nice designed product: Twelve South BookArc. You can save some space and increase wow-factor of your workspace a bit.

But is it safe for HDD to operate a Macbook when it is not parallel to the Earth surface?

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up vote 5 down vote accepted

It is safe to operate the HDD this way. There are many servers that use HDDs vertically.

Your main concern, while operating this way, would be the slightly worse cooling. The Twelvesouth guys are saying that they deliver better cooling, but they are comparing it to a closed and put on the table notebook. My experience shows that the best way to keep the notebook cool is to keep the lid open. If I want to use only my external monitor, I close it, wake it with the external keyboard/mouse and then reopen the lid (only the external monitor works and the cooling is best). Note that if you're not doing CPU/GPU heavy things (gaming, transcoding movies), you'll be ok.

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Strongly agree with you, cooling is another issue I've been thinking about while searching info about BookArc. Thanks for your answer! – NR4TR Apr 15 '11 at 10:18
@NR4TR did you find any reports of excessive heating? – Martín Marconcini Apr 15 '11 at 11:13

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