What is wrong with my WD 8tb?

[John S]

Hey again, how is it goiing?

Since i'm hanging around anyway here is another topic. Drive is toitally fine. Read/Write ~190Mb/s easily and yet have a look at another Victoria's screenshot.

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[Arch Stanton]

you mean the 1s reads?

[John S]

Obviously, yes. Where all these oscillations come from?

[Arch Stanton]

It wasn't obvious to me. Maybe you can use words next time to formulate an actual question.

[John S]

you were very helpful, thank you very much

[labtech]

Some blocks read a bit slower.
But no errors, so technically there is nothing wrong with the drive.
Are you trying something else with it and fails to accomplish the task?

[John S]

don't you see the pattern? this is not normal. i have lot of drives from 2tb up to 18tb. none of them has such oscillations, none of them has green blocks!

[John S]

you guys are killing me. stop asking start answering.

[pepe]

sounds like a command... so we should really start answering, guys.

[John S]

no, not a command, disappointing in your skills GURUs

[labtech]

Since you have a lot of drives, try finding another healthy purple surveillance model drive of the same family. Do a test on that. Do the graphs resemble the same pattern? If yes, then that is how these drives operate. If not, then there is a particular problem with this 8TB model.

The community does not know a whole lot about purple drives in working condition, because the majority of people here do NOT spend time looking at oscillations graphs on healthy drives. The majority spend time on non-working drives and recovering data.

[John S]

Since you have a lot of drives, try finding another healthy purple surveillance model drive of the same family. Do a test on that. Do the graphs resemble the same pattern? If yes, then that is how these drives operate. If not, then there is a particular problem with this 8TB model.

like i said - no, none of them behaves same way

The community does not know a whole lot about purple drives in working condition, because the majority of people here do NOT spend time looking at oscillations graphs on healthy drives. The majority spend time on non-working drives and recovering data.

i see my bad i'll leave

thank you all

[labtech]

Ok, if none of the same purple family of drives behave in the same way, then the last test I could think of trying is to test with another compatible PCB (+patient ROM) to rule out any processor or caching delays. I don't really expect that to be the issue.

But with this test, using another PCB would leave the potential issues to be related to either the heads assembly or disks condition.

[fzabkar]

Run the same test with HD Tune and examine the access time graph. Also do a short stroke test with HD Tune. That will show the serpentine zone size.

How to determine number of heads using HD Tune:
http://www.hddoracle.com/viewtopic.php?f=59&t=650

[pepe]

I would think the 'oscillation' is due to different spt of zones on different surfaces, and that all of your drives should show some level of it.
Maybe this drive has one surface significantly different than others...

i would not be worried about this part of the quesition.
About the green thing, it would be good to see if they show up at same locations during successive tests...

[fzabkar]

I would think the 'oscillation' is due to different spt of zones on different surfaces, and that all of your drives should show some level of it.
Maybe this drive has one surface significantly different than others...

That's what HD Tune will show.

[John S]

Wow! HD Tune provide totally fine results, despite what Victoria showed. Thanks a mil for point me to thet software.

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[fzabkar]

You can see the different data densities of 10 heads ... I think.

https://support-en.wd.com/app/warrantystatusweb

WD82PURZ-85TEUY0
WDVL8
7200
256M
SATA3 6GB/S
8.0 TB
10HD
SURVEILLANCE NON-CHINA DISTRIBUTION HGST