Sound at parked position and at the end of disk

WD Green 500Gb ( Part number: WD5000AADS-00S9B0 )

When it was new - it was completly silent in noaction and silent in seek.

Today when it is work it’s still silent. It is very silent in low load. But at no load, after it parks by IntelliPark, it is not silent - it has some sound like seek in very short range, but it is slightly different and louder.

Also It has this sound in sequental read at the end of disk. It starts from LBA 440Gb At become louder till LBA 500Gb.

Take a look at this article 

How to tell if the noise or sound the drive is making is normal

Noises from the internal drive sometimes may indicate failure is inmintent, in order to check if this is your case, you could try testing the drive with a diagnostic software. I always use the WD Data Lifeguard Diagnostics. You can click on the name to download the software and view the detailed instructions how to do the test.