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Butterfly test failure

by Steined / March 21, 2018 11:58 AM PDT

Hi.I've tried to test many external HDDs by HDDScan Butterfly Test and some of them failed to pass this kind of test.The drives are WD Mybook 3Tb and WD Mybook 4Tb.I guessed first the issue is related to HDD capacity but after testing a Mybook 6Tb that passed the test,I found that there might be another reason.I know how Butterfly test works by seeking 1 and n-1,2 and n-2 sector and so where n is the last sector.My questions are:
1-What's the reason or reasons of failure of this test??
2-Which parameters are related to this test?For exapmle : Speed? Spin up time? or ...?
3-Is there any SMART value related to this test that could be measured or compared with other drives that pass the test?
4-Is that a bad sign for health or performance of drive ??

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Clarification Request
The makers will likely not answer.
by R. Proffitt Forum moderator / March 21, 2018 12:08 PM PDT
In reply to: Butterfly test failure
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Butterfly Test
by Steined / March 22, 2018 8:43 AM PDT

Unfortunately there is no support forum available for HDDScan.But Butterfly test has unique algorithm and my question is about Butterfly test not HDDScan.Why it fails on some drives of same series from same manufacturer??

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That sad to read.
by R. Proffitt Forum moderator / March 22, 2018 10:23 AM PDT
In reply to: Butterfly Test

If there is no support and the author won't answer as well as the HD maker, then there is no answer yet.

My advice is to use the maker's test next.

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2 drives passed test by other softwares
by Steined / March 22, 2018 2:37 PM PDT
In reply to: That sad to read.

2 drives I've mentioned passed all the tests by WD Life Guard test software by manufacturer also passed tests by following programs:
HD Tune
Macrorit Disk Scanner
Check Drive
Ariolic Disk Scanner
Also passed the Verify,Read and SMART tests by HDDScan.The only test that failed is Butterfly by HDDScan.
I don't know what is the problem??

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I think I may upset you.
by R. Proffitt Forum moderator / March 22, 2018 2:47 PM PDT

If eight or more apps pass then isn't the problem the test app that failed?

I don't want to be Captain Obvious here but many test apps do present problems like this. And if the author won't answer, then how can we? It's their code, they need to answer. If they don't then you are left out in the cold.

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by Steined / March 27, 2018 8:54 AM PDT

OK.Thanks anyway.

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