If you’ve recently converted to Linux from Windows, or if you’re just giving Linux a shot, there are a few things you need to know right off the bat about how Linux works and where the major differences are when compared to Windows. Some of the fundamental components are different between the two operating systems, and the way things are done can be drastically different; you need to learn these differences to be able to use Linux effectively, and to avoid trying to force Windows metaphors onto a Linux system that doesn’t accept them.
Here is a list of five tips that beginner Linux users should know:
1. Drives don’t have letters, they have mountpoints
The first thing that usually trips up people who come from Windows to Linux is that filesystems aren’t assigned letters the way they are in Windows. Instead, there is a single root filesystem whose path is “/”. If you must use the Windows analogy to help you conceptualize it, you can think of this as the C:\ drive; it’s the top of the filesystem.
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http://techthrob.com/2010/06/12/5-things-new-linux-converts-should-know/