USB 3 is often more than enough if you're thinking of using regular spinning disks. I have a ThinkCentre mini with 3x USB 3 ports. I've connected 4 external disks to it, 2 of them directly and 2 via a USB 3 hub. It purrs happily without a fault. Just make sure the cables aren't easy to disconnect accidentally while it's working. E.g.:
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seems like a fire hazard no?
The case is fireproof up to 200°C. Internal ICs will burn much earlier than that and hopefully stop, if the devices were designed competently. 🤭
How bad are the vibrations?
Not bad at all. These are 4 external WD drives. The actual disks are mounted on big ass rubber mounts to the cases. They're quieter than bare disks in a PC case.
To add simple storage you could go with something like this: https://www.amazon.com.au/dp/B0BQ6SHNP1?
I was blown away at the cool design (the case and cover are the heatsink, you install it with a thermal paste pad inside - how cool is that?!) and how inexpensive 1TB m2 cards are now.
If you want expandable storage, then maybe a NAS?
Husband set up one a year or so ago and it has been really cool. Easy to back up and access anything on it.
I was going to suggest something just like this !
ugreen is Chinese, but one of the good ones.
so far not been disappointed by Ugreen
Same, everything we have purchased from them has been high quality.
I already have an external HDD. Maybe I can try the setup out with that.
If you need to add more than one drive you should look at external enclosures. There are 4-drive models just over $100 and 8-drive models just over $200. You connect them with eSata, USB 3, or USB C, depending on the enclosure.
Got an e sata port?
No, unfortunately.