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!