Need hepl reading HDDscan result

[Distress]

Below is the screenshot of HDDscan verify (Read data without transfer).
I don't know about orange red green grey blocks. How do you interpret HDD health and performance based on this result? BTW it is just 57% scan
Harddisk is WDC WD 5000AAVS-00ZTB

[/IMG]

 

[Distress]

here is the full scan result

 

[roony]

Some of the blocks on the drive are being read slower than others, indicated but the different colors. Doesnt mean the drive is bad, but maybe it could mean its getting on with age.