[SOLVED] Why the difference in HDD surface scans?

[Netslands95]

I have had two Toshiba HDWD130 hard drives in my PC for two years. I ran a victoria surface scan for both of them yesterday, and the result is horrible, but when I connect them to an external hdd docking device, they suddenly returned to normal.

When connected to motherboard

When connected to external hdd docking device.

Motherboard: Gigabyte B360 HD3P
CPU: Intel Core i5-8400
Memory: 2 x Kingston 8G DDR4-2400

What is the problem here? I have absolutely no idea, since I've changed PSU from Vp550p to NE550 Gold, and also changed the data cable, the problem is still there.

 

[fzabkar]

Do both HDDs produce the same graphs?

I notice that the weird result has 83 instances of 1.0sec slow sectors.

You could run the same test in HD Tune.

 

[Grobe]

The time between each drop seems constant, means there is a program or service that is constantly writing or reading from the disk.

 

[Netslands95]

Thank you guys for answering. I've figured out that it's the Moo0 System Monitor which caused the problem. The HDD temperature monitor interferes with the read test. I turn it off and the dips are gone.
So Grobe, you are right .