Seagate IronWolf Pro 4TB, Enterprise Internal NAS HDD, CMR, 3.5 Inch, SATA 6GB/s, 7.200 RPM, 256MB Cache for RAID NAS, Data Rescue Services, Frustration Free Packaging (ST4000NTZ01)

If you are building a NAS or upgrading your home server, you probably already know that IronWolf Pros are the gold standard. I popped this 8TB into my bay and it was recognised instantly. The key thing here is that it’s a CMR drive (not SMR), which is vital if you care about your data integrity in a RAID setup. The transfer speeds are consistently high and it feels bulletproof. Just a heads up: These are Enterprise-grade drives, which means they are designed for performance, not silence. You will hear the familiar "chugging/clicking" noise when it’s writing data. It doesn't bother me—it actually reassures me it's working—but don't expect it to be silent like a standard desktop drive. Expensive, but worth it for the peace of mind.

I bought the Seagate IronWolf Pro 16TB for my NAS setup, and it's exactly what I needed—reliable, spacious, and enterprise-grade through and through. First off, 16TB of storage is a glorious amount of space. I’ve loaded mine with Plex media, backups, and surveillance recordings, and still have room to breathe. This is proper CMR technology (not the dodgy SMR stuff), which is a must for RAID performance and data integrity. The 7200 RPM speed and 256MB cache make a noticeable difference, especially in multi-user environments. Transfers are fast, consistent, and there's no lag when indexing large volumes of data. It runs smoothly in my Synology NAS with zero fuss. Noise and vibration levels are surprisingly reasonable for such a large-capacity drive. It’s not silent (it’s spinning 7,200 RPM after all), but Seagate’s vibration dampening tech is doing its job well. Temps stay in check too. Bonus points for: RAID optimization – it just works Data Rescue Services included – peace of mind in case disaster strikes Frustration-Free Packaging – arrived safely, minimal waste, no nonsense Final thoughts: If you're serious about long-term storage, RAID setups, or just want a rock-solid drive that won’t blink under pressure, the IronWolf Pro series is well worth the investment. Yes, it’s not cheap—but this isn’t your bargain-bin hard drive. It’s a heavy-duty workhorse made for people who care about their data. Highly recommended for NAS users, small business setups, or any data hoarder with standards.

Let me start by saying: this is exactly what I needed for my multi-bay NAS setup. What I love: • Optimized for NAS performance. With AgileArray technology, dual‑plane balancing, rotational‑vibration (RV) sensors, and TLER, it delivers seamless RAID performance even in busy multi-drive environments. • Always‑on reliability. Built for 24/7 operation with an enterprise-grade 550 TB/year workload rating and an impressive 2.5 million hours MTBF. • Peace‑of‑mind warranties and recovery. Comes with a 5‑year limited warranty plus 3 years of Rescue Data Recovery service—nice knowing data recovery is covered. • Healthy NAS integration. IronWolf Health Management means your compatible NAS can monitor the drive’s condition and raise alerts proactively.  • Strong performance specs. SATA III interface, 7200 RPM, and a beefy 256 MB cache keep things speedy and responsive. All in all, it’s rock-solid, enterprise-level quality housed in a consumer-ready 3.5″ form. Any downsides? • Spinning rust limitations. It obviously can’t match SSD speeds, but for mass storage, video archives, or backup—it’s still very fast. • Price per TB. It’s a premium product, so if budget is tight or you’re only building for light tasks, other options offer value. Final verdict: If you want a reliable, NAS-friendly drive with enterprise backing and peace of mind, the Seagate IronWolf Pro 8 TB is a standout. Perfect for creative professionals, small businesses, or serious home users who demand uptime and robustness. Highly recommend!

Really poor quality control. Ordered four 16TB disks. Two won't even register as alive on NAS or PC (using USB adapter), they just sit there beeping every 5 seconds. Thought two were ok but one of them fails SMART checks and refuses to format, so one usable out of four. Given this was their "Pro" drives it's really disappointing. Never had disk problems like this before (used lots of WD and Seagate drives). -- Update. I got replacements for 3 broken drives and got another. Now have 5 drives that seem to be working without issue. So maybe just got unlucky initially, either with Seagate or the delivery driver. Still knocking a star off for initial problems. The drives have good performance and are relatively quiet in my NAS. 64TB of storage (with a parity drive to protect against loss), should be adequate for quite some time.

Working well, excellent speeds and good storage capacity for the price. Easy to install into my NAS.

Arrived very quickly and installed easily into my NAS server as a hot swap for a faulty WD Red. Very pleased with it's performance so far.

Working well in my 4 Bay NAS Noise is not a problem. Currently manage three NAS drives with a total of eight 4TB drives. No failures in the last three years. Used in three different NAS manufacturers units

I bought two of these hard drives thinking they’re the best for my NAS. On receipt and installation I hear a grinding noise coming from the hard drives. It stops when there is no data is being transferred. I know a little bit of noise is to be expected when data is transferred but this is a grinding noise. I bought these on the basis that they are the pro version and that they’d be reliable for their intended purpose. I am not sure if it’s a fault with these specific drivers or if this is the case with these type of hard drives. I have not used Seagate hard drives before. I have always used Western Digital which I never experienced issues with.

It is still a little bit small to store my movies in. /Thomas

Es un bicharraco. Grande, grande en capacidad, silencioso y rápido. Llegó muy bien envuelto y en perfecto estado. Tras escaneo de superficie está perfecto en cuanto a sectores. Como es de Helio suele tener 3 grados menos que el resto de discos con los que está. Muy contento con él y repetiría. Espero que esta reseña sea de utilidad.

Not a trustworthy seller. Upon checking the hdd serial number on seagate, no warranty was left on the hdd. Also no recovery plan as wrongly advertised. Most probably that is not an authorized distributor.

Het pakketje is zoekgeraakt bij DHL, ik heb gelukkig wel mijn geld terug gekregen.

Opened package, installed into NAS. No problems noticed. (Then it took 2.5 to finalize the raid-integration :-) ).