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I recently switched my harddrive to an ssd. I am wondering, do I need to do anything when using Virtualbox and Ubuntu (guest) on a Windows 7 host?

I know that for Windows 7 defragmentation and indexing should be turned off. But how about Ubuntu? I am not familiar with Ubuntu and don't know if running it in a virtual machine makes any difference?

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Ubuntu don't use defragmentation so there is no need to turn it off. But you can disable some features.. see this guide.

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