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Sounds bogus to me.
RAM keeps its contents by virtue of having power. Cut the power, lose the contents. Simple! And a page or swap file or virtual memory partition would have been written to successfully when the machine was powered up, and couldn't possibly be touched again once the machine is powered down.... Used to be (like 15 years ago) you had to "park" the hard drive head at shutdown time for fear of mechanical contact between the head and the platter causing damage to the contents of the disc. Haven't heard anything about that in a long time, so I imagine it's either happening automatically, or no longer necessary.
This is exactly the kind of question your teacher is <i>hoping</i> you'll ask, I'll bet. Either he knows what he's talking about and you misunderstood horribly, or he was blowing smoke. Either way, find out and let us know!
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