Nope, this shouldn't be necessary and I don't think it's the solution (since you blacklisted the JMS578 and not a HDD). Can you please provide
dmesgoutput again and also from
lsusb -t(or simply
I'm still thinking about an underpowering problem which is simply masqueraded by forcing the HDD to operate more inefficiently (the old Mass Storage mode is a mess compared to UAS)
I did order another sd-card on Saturday, and once it has arrived, I will setup a separate 8TB OMV system disk so that I should be able to swap HDs and sd-cards simultaneously.
Then I will report back.