With the "HDTUNE" test drives, out of a yellow dot, what does this mean?

Users questions:With the "HDTUNE" test drives, in the 'benchmarking' drew to a close, there a yellow dot. What does this mean? (20.3MB * s average transfer rate, access time of 18.3ms, burst transfer rate of 26.9MB * seconds, CPU usage 4.6%) of these yellow spotsThere are a few hundred. My computer is very slow hard disk problem?
Experts answer: is a track there is a problem quickly buy a new hard drive, the important data transferred to the new hard drive, to prevent any eventuality.
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