It's A Digital Disease!

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New WD_BLACK D10 12TB major speed degradation when reducing space (and compared to 2020 reviews). Normal? (zerobytes.monster)

submitted 10 months ago by bOt@zerobytes.monster to c/datahoarder@zerobytes.monster

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The original post: /r/datahoarder by /u/varignet on 2024-11-26 23:07:52.

Hi, I just received a new WD_BLACK D10 12Tb mounting the HC520 HGST HUH721212ALE604 .

I noticed that transfer speeds drop quite a lot when adding data to the disk.

Also, my read speeds are always slower than my write speeds but reviews online from 2020 always show matching read/write speeds.

Is this normal or should I request a replacement?

When empty, the disk ATTO writes/reads are 245Mb/s - 242Mb/s

After having added 2Tb of data to it, my writes/reads dropped to 224Mb/s - 212Mb/s (see the slower read speeds)

When doing a full surface scan, I noticed that the speeds started at 230MB/s and dropped to 179Mb/s at 3Tb, 173Mb/s at 6Tb and 120Mb/s on the last Terabyte. Is such speed deterioration normal?

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