It’s surprising how quickly storage drives can fill up. As soon as you think you have enough, you blink your eyes and suddenly wondering what you can delete to free up space. Honestly, you can never have too many storage drives — even when they’re enormous. That’s why we’re so happy to see this 4TB Samsung T9 portable SSD on sale for $300 at Amazon, a huge 45% discount off its $550 MSRP. There are so many reasons to want one of these. Our reviewing expert Jon Jacobi gave the Samsung T9 portable SSD a near-perfect score and our Editors’ Choice award, finding that it doesn’t just offer great per…