One way to think of the difference between these different types of storage is to imagine them as paper documents. The cache is a list of names or numbers you constantly refer to and keep close at hand. A folder full of papers you may need for your current task is similar to computer memory or RAM. The file cabinet full of folders for all your projects is like the storage on your hard drive.
Memory problems are less common than other computer problems because memory sticks have no moving parts and thus fewer points of failure. However, due to this many RAM problems go undiagnosed. Memory usually will last longer than other computer components so manufacturers offer longer warranties for it than other parts. If you buy brand name memory it will likely have a lifetime warranty.
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