jeepers that sounds bit of a nightmare.. bad enough when that volume of data is iffy with out the usb prob.It's a Macally Firewire/eSATA/USB drive enclosure. The firmware limits it to 1TB drives and it's age limits it to lower-powered drives. I have a 1TB Western Digital Green in there which I use to store periodic dumps of my Camera Uploads folder from Dropbox.
I don't really trust it overmuch, so I don't store anything I can't afford to lose on it - but it's more dependable than the second unit I got which is USB and ethernet. It is however, useful for some situations where I need to temporarily store files before moving them elsewhere.
I got it off eBay, so I can only link to some other site offering it for sale: https://www.newegg.com/macally-g-s350sua/p/N82E16817347017
Note that this one is 2TB, mine is limited to a 1TB drive max.
EDIT: This one, below, is the problem child. I got it recently as a NAS, but the firmware is garbage so I used it as USB 2.0. Last weekend it decided to bomb on me during a copy operation and it took down all of my MacPro's USB ports. Fortunately, I was able to reset the ports and they all work now.
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But I have zero faith in this drive enclosure now.
That macally enclosure ..wonders if there'd be a possibility of getting a raspberry pi in that case..building an actual mini me mac pro.???