One of your HD's is approaching or has passed a threshhold that indicates failure according to the drive manufacturer. You can investigate the specifics but your first priority should be to back up the drive. Things usually get worse very quickly. I can't say if Dell's warning is early or near the end.
Many free programs such as HDTune can dump and display the SMART properties. But again, I've learned the hard way to back up anything important pronto. It's never good to look back at time wasted after the drive is toast.
Good luck!
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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