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Question My friend has two identical hdds but different trasfer speeds! !!

Mario Italia

Great
Jul 12, 2020
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So my friend got twI identical HDDs last month, and when he decided to run benchmarks using HD tune he noitced the maximum transfer speed is like there's 10 megabytes per second difference btw the harddrives, also he noitced the non os hdd is slightly slower then the os one, by the way both hdds use different firmware revision.
WD Red Pro 4TB NAS Internal Hard Drive - 7200 RPM Class, SATA 6 Gb/s, CMR, 256 MB Cache, 3.5" - WD4003FFBX
 

Mario Italia

Great
Jul 12, 2020
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A friend is running two identical HDDs in the same case, same specs and same model, but when he benchmarked them, he noticed there is like 10 megabytes per second difference in transfer speed, also one is louder and slightly faster and two hdds have different firmware version, is it normal?
 

Mario Italia

Great
Jul 12, 2020
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How did he "benchmark" these?

Please show screencaps of CrystalDiskMark results.
He lives in different city and he used HD tune to benchmark them, the louder and the faster one scored 180mb/sec transfer speed and slower and quiter one scored 167mb/sec at peak, like I said they are identical model but different firmware revision.
 

Mario Italia

Great
Jul 12, 2020
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And how many times was this test run? And was the transfer testing identical data from an identical source? And are they connected to similar configured ports? So many factors here.
It's MSI Z370 GAMING PRO CARBON and they are connected to Sata 3 ports using identical Sata cable type and model .
 

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