You may not be able to do RAID or other redundant/performant arrays with USB. You can definitely achieve a big JBOD array but it will be less resilient and slower than a RAID array. Enclosures often don’t cool as well so heat may degrade your disks faster as well. I did this for a while with some old disks and some $30 HDD toasters. I only put data on there I could afford to lose. I wish there was a standalone hardware RAID solution… like a NAS without the network. That would have a huge draw for hobbyists that don’t want to buy an expensive NAS. I’ve searched for this but haven’t found anything. Message me if you know of such a product! Maybe consider building your own NAS with an old PC. Way cheaper than a prebuilt and fun to build! I had an old Dell Optiplex 990 that is now a 32 TB NAS. Had to get a new case but it’s a decent backup to my Synology.
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That's why you should always use them as jbod and setup Linux software raid (or zfs raid? Not familiar) directly.
Never go without a raid... Not a good idea in any case.
As for heat, I used jbod enclosures with fan, anything with more than 2 drives should have one, or don't bother.
I wouldn't go with single drive enclosures (even if I did for 10 years) as better not to cheap out on this matter. A 4 x 10€ cheap enclosure might be tempting, but shilling out 100€ for a nice actively cooled 4-disk jbod is a much better choice. Then go sw raid on top of it.
I used USB enclosures for my RAIDs for over 20 years. The turning point has been usb3 and then usb-c even better, but I found really no difference as in the bottleneck where the mechanical drives.
Moved to an all internal sata setup a few months back because I upgraded the space and moved to a desktop form factor.
Can still recommend the USB approach tough.
BUY A QUALITY EBCLOSURE.
I always used Linux software raid, but purchased a 4 slots USB raid/jbod enclosure to keep the number of used USB ports down.
I never ever had issues with the setup, but I purchased a known-brand enclosure, one with also e-SATA, which unfortunately was/is more a fad than even been really used.