2 equal 3.0 Harddisks but diffrent speed

  • Hello,


    yesterday I set up a Raspberry 4B with Open Media Vault and connected a 4 TB USB 3.0 HDD (brand new) from Western Digital(HDD1). The File system is ext4. Everything works more or less good since I have a data throughput of 60 - 100 MB / sec. when copying from my laptop to the NAS which is ok for me. This morning I connected another HDD (the same model, also brand new, HDD2)). So I deleted the hdd first, then added a file system and set the user rights.... Just the way I did with HDD1. But copying on HDD2 is far slower (only 8 - 10 MB/sec) and I have no clue why.....


    What I tried yet.......

    I changed the ports. => HDD 2 keeps slow, HDD1 is still fast

    I used a USB 3.0 Hub with an external power supply with 5V and 3A => HDD 2 keeps slow, HDD1 is still fast

    I disconnected HDD1 => HDD2 is still slow

    I connected both HDDs to my Laptop. => Both HDDs are recognized as USB 3.0 devices and copying is fast.


    Anyone out there has an indea what I could do? I appreciate any help! :)


    Best regards

    Manuel

  • Anyone out there has an indea what I could do? I appreciate any help! :)


    Best regards

    Manuel

    Do not USB USB disk for a NAS, better use SATA disk

  • Hey raulfg3,


    what u exactly mean? Maybe it's better but 80 - 100 MB/Sec is ok for me. In addition I wanna add 4 HDD's step by step and as I saw there are SATA adapters for Raspberries (for only one HDD) but they are also connected via USB....


    There must be a reason why one HDD is "slow" while the other one is "fast"........ I'm not really into Open Media Vault yet but I have technical understanding... and according to what I know that can't be the problem. But maybe u explain it.


    Later that day I will delete the HDD2 again and set it up from zero. Maybe (I don't think so yet but we'll see) that will help to eradicate the problem.


    Best regards

    Manuel

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