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Seagate IronWolf 525 Review (vs. IronWolf 510): A Cool but Unneeded Upgrade

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The Seagate IronWolf 525, first announced today, is the PCIe 4.0 version of the 2020 IronWolf 510 to rival the Samsung 980 PRO or the Crucial P5.

And while the new SSD is a clear upgrade to the previous model, it's not a must-have. For one, it wasn't decidedly the fastest drive in my testing.

Most importantly, as a NAS-oriented SSD, it's ahead of its time—there are no home or small-business NAS servers I know that support PCIe 4.0 yet. As a matter of fact, there are just a handful of servers that support PCIe 3.0 NVMe SSDs.

But like its older cousin, the IronWolf 525 works with non-NAS applications, too. (It's also compatible with PCIe 3.0.) And in this case, its long endurance and the reasonable cost of $150, $250, and $450 for 500GB, 1TB, and 2TB, respectively, make it worth the investment.

If you have a computer that's PCIe 4.0-ready or need to write a lot of data daily, the Seagate IronWolf 525 SSD sure is an exciting option.

Seagate IronWolf 525 SSD
The Seagate IronWolf 525 looks like a typical NVMe SSD.

Seagate IronWolf 525 SSD: Top performance over endurance ratio

The IronWolf 525 is Seagate's second NAS-oriented SSD and the first of its type that supports PCIe 4.0. And for that combo, it's a top-notch NVMe drive.

Pick just performance or endurance individually, though, and it's not the best I've seen.

Less endurance than the previous model, still excellent logivity

Indeed, the new IronWolf 525 has about 20% less endurance than the IronWolf 510 drive. The 2TB version, for example, can handle up to 2800TB written to it, significantly less than 3,500TB of the 1.92TB IronWolf 510.

However, considering the extreme endurance of the IronWolf 510, the IronWolf 525's is plenty—much more than any other PCIe 4.0 NVMe SSDs I've seen.

Specifically, the drive has an endurance rating of .7 drive written per day (DWPD) accompanied by a 5-year warranty. That means Seagate guarantees that if you write 700GB per day and every day to the 1TB version, you'll have to do that continuously for five years before the drive becomes unreliable.

Now, if you write just a tenth of that, 70GB, which is already much more than most of us write on a good day—most days we don't write anything at all --that'd take you 50 years.

In short, the IroWolf 525 has double the endurance of any other non-NAS PCIe 4.0 SSD, including the Samsung 980 PRO and the Crucial P5.

Seagate IronWolf 525 vs. IronWolf 510: Hardware specifications

Like the IronWolf 510, the new IronWolf 525 is a standard NVMe drive.

As such, it's 22 mm wide and 80 mm long. Like all double-side SSDs, the drive is about 0.14 in (3.58 mm) thick.

Seagate says the IronWolf 525 can handle 24/7 workloads without performance degradation—it's a drive designed for a NAS server.

 Seagate IronWolf 525 NVMe SSDSeagate IronWolf 510 NVMe SSD
Part Number
InterfacePCIe Gen 4x4,
NVMe 1.3
PCIe Gen 3.0-compatible
PCIe Gen 3x4, 
NVMe 1.3
DesignM.2 (2280) M.2 (2280) 
Max Average Power
2TB/1TB: 6.5W
500GB: 5.6W
192TB/960GB/480GB: 6.0W
240GB: 5.3W
Average Power
2TB: 30 mW
1TB/500GB: 20 mW
1.92TB: 2.0W
960GB: 1.95W
480GB: 1.83W
240GB: 1.75W
NAND Flash MemoryKioxia BiCS 4 96L 3D TLC NAND3D TLC
Sequential Read
(Up to)
5000MB/s1.92TB/960GB: 3,150 MB/s
480GB: 2,650 MB/s
240GB: 2,450 MB/s
Sequential Write
(Up to)
2TB/1TB: 4400MB/s
500GB: 2500MB/s
1.92TB: 850 MB/s
960GB: 1,000 MB/s
480GB: 600 MB/s
240GB: 290 MB/s
(Terabyte Written)
2TB: 2,800 TBW
1TB: 1400 TBW
500GB: 700 TBW
1.92TB: 3,500 TBW
960GB: 1,750 TBW
480GB: 875 TBW
240GB: 435 TBW
Mean Time Between Failures (MTBF)1,800,000 hours1,800,000 hours
U.S. Suggsted Retail Price 
(at launch)
2TB: $450
1TB: $250
500GB: $150
1.92TB: $519.99
960GB: $309.99
480GB: $164.99
240GB: $259.99
Release DateSeptember 21, 2021June 10, 2020
WarrantyFive yearsFive years
Hardware specifications: Seagate IronWolf 525 vs. IronWolf 510 NVMe SSDs

IronWolf Health Management, Rescue Data Recovery Services included

As a NAS SSD, the IronWolf 525 comes with IronWolf Health Management, a software application embedded within supported NAS servers, including those from famous NAS makes—Synology, QNAP, Asus, and more.

The software enables users to manage the SSD's health in real-time and even predicts when a drive might fail, which is always helpful.

It's worth noting that in most NAS applications, NVMe SSDs are primarily for caching and not the primary storage. As such, data retention is more of a performance issue than the integrity of information.

But you can use the IronWolf 525 in non-NAS applications, too. And in this case, its included three years of Rescue Data Recovery Services can come in handy.

Seagate IronWolf 525 NVMe SSD: Detail photos

Seagate IronWolf 525 SSD vs. IronWolf 510 SSD
The Seagate IronWolf 525 SSD (bottom) shares the same retail box design as the previous IronWolf 510 drive.

Seagate IronWolf 525 SSD
The Seagate IronWolf 525 SSD is a standard M.2 NVMe SSD—it's 22mm wide and 80mm long.

Seagate IronWolf 525 SSD
It's a double-sided SSD that can deliver up to 2TB of storage space.

Seagate IronWolf 525 SSD
The Seagate IronWolf 525 SSD is about as large as a stick of gum.

Seagate IronWolf 525 SSD
Here's the Seagate IronWolf 525 SSD working inside a desktop computer.

IronWolf 525 SSD: Fast(er) yet familiar performance

I tested the IronWolf 525 SSD using two 1TB drives, both as caching for a Synology DS1621+ NAS server and a boot drive of a gaming machine and found the performance quite interesting.

The same catching experience

As a RAID 1 caching solution, the IronWolf 525 delivered the same performance as the older model. However, that was likely because the server doesn't support PCIe 4.0 but just PCIe 3.0.

The thing is, there's just no need for most NAS servers to support PCIe 4.0 (though that doesn't hurt.) That's cause I can't think of any NAS applications that require upgraded speed, especially for a home.

On top of that, the throughput speed of a server is limited by its network ports anyway. Which is much slower than the bus speed of PCIe 3.0, never mind PCIe 4.0.

Other than that, the IronWolf 525 worked well as cache SSDs, just like its older cousin. That's if you need caching at all—I generally find NVMe caching a bit unnecessary. You're better off getting SATA SSDs, such as the IronWolf 110 or the WD Red SA500, and use them as the primary storage of the server itself.

On top of that, most of the time, you won't need more than 250GB when it comes to caching, so you might end up spending more than you need if you get the IronWolf 525.

Improved scores, excellent real-world experience

When used as a regular NVMe SSD, however, the IronWolf proved in my testing to be much faster than the previous model, though it wasn't faster than any of its PCIe rivals.

Seagate IronWolf 525 Random Access Performance
Seagate IronWolf 525 Random Access Performance

That was likely because this is a drive turned more for endurance than performance. And don't get me wrong, it was still really fast.

In fact, it was the fastest in the sequential (copy) test when doing both writings and reading simultaneously. 

Seagate IronWolf 525 Copy Performance
Seagate IronWolf 525 Copy Performance

Most importantly, I also tried using the new SSD as the primary storage of a gaming computer and found no discernable differences in real-world experience compared to the Samsung 980 PRO or the Crucial P5.

The computer took less than 10 seconds to boot up, and most apps launched instantly.

The fact the Seagate had some three-time endurance compared to the Samsung made using it even more fun. I didn't have to think twice before doing some crazy write job on it.

Seagate IronWolf 525's Rating

8.2 out of 10
Seagate IronWolf 525 SSD 3
8 out of 10
8.5 out of 10
8 out of 10


High endurance

Excellent real-world performance and RAID support

Three years of data rescue services included

5-year warranty


Slower than PCIe 4.0 rivals

Limited NAS use


Again, the Seagate IronWolf 525 SSD is not a must-have but still an exciting option for those with PCIe 4.0-ready computers.

And if you happen to write a lot, or don't want to have to deal with that endurance anxiety, this SSD sure is worth the investment. It's especially great if you're getting two for a RAID 0 setup. In this case, the longevity and included data recovery service will give you some extra peace of mind.

As a caching SSD for your NAS server, though, I'd see no reason to get this drive over the older model. That's because, in any case, you'll get the same performance but slightly shorter endurance out of it.

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