This was two years ago. Unfortunately since then I did not have any troubles with my Notebook, so I had no opportunity to call in the Dell support. Actually back then I did not have a problem either, but I was not sure about that. My notebook's hard drive would emit a faint clicking sound occasionally - only noticeable because being fanless, this was the only noise the notebook would create at all.
Apparently it is normal, but when I called Dell about it, they insisted on exchanging the drive just in case. Because I was contracting at the time, they offered to come around to the office at the company where I worked. When the Dell technician arrived the next day, I went into an empty room with him and he exchanged the hard drive within minutes. Then he left.
My notebook has worked without any problems ever since.
I didn't tell my girl-friend about it, because she doesn't care, but whenever I see a chance to recommend a Dell product, I wholeheartedly do so.
Hm, this would have made a great blog post, but now I wasted the story on HN already. Ah well...