Samsung 1TB SSD SATA III 2.5"

The Samsung 850 PRO is a 1TB SATA III SSD that maxes out the interface at 550 MB/s read and 520 MB/s write. Its 10-year warranty and 150 TBW endurance are still impressive, but prices swing from USD 178 to USD 484, so shop carefully. It's a great pick for older SATA-only systems, but anyone with an M.2 slot should buy an NVMe drive instead.

Let's talk numbers. The 850 PRO hits 550 MB/s sequential read and 520 MB/s write, with 100K random read IOPS and 90K random write IOPS. For a SATA III drive, that's basically the ceiling. SATA III tops out around 600 MB/s in theory, so Samsung squeezed nearly everything out of this interface. In our database, that puts it at the 34th percentile for speed overall, which sounds rough until you remember it's competing against NVMe drives that do 7,000 MB/s. Against other SATA drives, this thing is still a top performer.

The random performance tells a more nuanced story. 100K read IOPS and 90K write IOPS land at the 45th percentile, which is middle of the pack. For everyday tasks like booting Windows, launching apps, or loading game levels, you won't notice much difference between this and a faster NVMe drive. The bottleneck stops being the drive and starts being everything else. But if you're doing heavy sustained writes, like editing 4K video or running a database, the SATA interface will hold you back. The 850 PRO's TLC NAND with Samsung's MEX controller and DRAM cache keeps things steady, but it can't break physics.

The 850 PRO's biggest problem is that it's fighting against drives from a different era. The Crucial T500, Kingston Fury Renegade, Lexar Professional NM1090 PRO, Team Group MP44, and Western Digital BLACK SN850X all use NVMe and blow past the 850 PRO's 550 MB/s without breaking a sweat. The SN850X, for example, hits speeds several times faster and often costs less per gigabyte. If your system has an M.2 slot, there's no reason to buy a SATA drive unless you're out of slots.

But if you're stuck on SATA, the comparison shifts. The 850 PRO's endurance and warranty are the differentiators. Most modern SATA drives offer 3 to 5 years of coverage and lower TBW ratings. The 850 PRO's 10-year warranty and 150 TBW endurance mean it'll likely outlive the computer it's installed in. The trade-off is price and availability. You're paying a premium for reliability on an interface that's being phased out. For a NAS or a machine that just needs to keep working, that's worth it. For a gaming rig, it's not.

Here's where things get weird. The 850 PRO is listed at USD 178 to USD 484 across four US listings. That's a USD 306 spread for the exact same drive. If you're paying USD 400 or more for a SATA SSD in 2025, you're getting fleeced. At USD 178, it's a reasonable buy for an older system. At USD 484, you could get a 2TB NVMe drive with money left over.

The best deal in our database comes from Newegg's refurbished listings, which sit at the lower end of that range. But refurbished means you're gambling on how much life the drive has already used. The 150 TBW endurance rating helps here, since even a heavily used 850 PRO likely has plenty of writes left. Still, for a drive that's been out of production for years, paying new prices for used hardware stings. If you can find it under USD 200, it's a solid value. Above that, look elsewhere.

The Samsung 850 PRO is one of those drives that built Samsung's reputation in the SSD world. It's a 1TB 2.5-inch SATA III drive that topped charts when it launched, and even now it holds a 94th percentile feature ranking in our database. That's not because it's new, it's because Samsung packed this thing with stuff most budget drives still skip: hardware encryption, a 10-year warranty, and endurance numbers that make newer drives look flimsy.

Who's this for? Someone with an older laptop or desktop that still runs on SATA, not NVMe. Maybe you're reviving a machine from 2015, or you want a reliable boot drive for a NAS or a secondary system. The 850 PRO isn't going to win any speed contests against modern M.2 drives, but it's not trying to. It's trying to be the last SATA drive you'll ever need to buy for that machine.

What makes it interesting is the gap between its specs and its price. The 150 TBW endurance rating and 2,000,000 hour MTBF are genuinely impressive for a SATA drive, and the 10-year warranty is basically unheard of now. But you'll pay for that peace of mind, and prices swing wildly depending on where you shop. More on that later.

Anyone with an M.2 slot should skip this drive without a second thought. The NVMe alternatives in our database, like the Crucial T500 or Kingston Fury Renegade, deliver several times the speed for less money. Paying USD 300 or more for a SATA drive when a faster NVMe costs less is just bad math.

Also skip it if you need portability. The 850 PRO scored a 16.5 out of 100 for portable use, which is one of the worst we've seen. It's a 2.5-inch internal drive, not a portable SSD. If you need something to toss in a bag, look at external USB-C SSDs instead. And if you're building a new system from scratch, don't build around SATA. Get a motherboard with M.2 slots and leave the 850 PRO to the folks keeping older machines alive.

If you're reviving an older laptop or desktop that only has SATA ports, the 850 PRO is still a great choice. The 550 MB/s read speed will make that machine feel brand new compared to a spinning hard drive, and the 10-year warranty means you won't have to think about it again. The endurance rating is high enough that even a refurbished unit should have years of life left. Just don't pay more than USD 200 for it.

For anyone with an M.2 slot, skip this entirely. The NVMe alternatives are faster, cheaper, and easier to find. The 850 PRO is a relic, but a well-built one. It's the drive you buy when you need reliability and compatibility, not raw speed. If that's your situation, grab one from Newegg's refurbished stock at the low end of the price range and call it a day.