It doesn't look like even USB v4 is fast enough on the consumer side for 30TB.
Take it from me. I refused to buy pluggable media larger than 64GB because between Lexar and PNY it's bad enough. Trying to fill one of those babies which was USB v2.0 promised to take eight hours or longer. I thought it should have copied large files faster, shown that I was mistaken. Instead when the "typical" Linux OS copies files to an USB v3.1 disk plugged into USB v2.0 port, it tends to send the stuff into RAM, and then it becomes irritating and noticeable when that pluggable disk has to be ejected.
USB v3 media doesn't seem to last very long anymore. I had two drives fail me this year, they seem to want to be plugged only into "Super Speed" ports or they prefer Windows.
A bit off-topic: I would like to get a "gamer's" SSD which is 256GB but it costs like one dollar per gigabyte excluding taxes. I don't know how to install it on a computer that has a device Linux calls "/dev/mmcblk".