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Seagate 12TB IronWolf Pro 7200 rpm SATA III 3.5" Internal NAS HDD (CMR, Retail, 4-Pack)

BH #SEST12000N4K
165 reviews
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Seagate 12TB IronWolf Pro 7200 rpm SATA III 3.5" Internal NAS HDD (CMR, Retail, 4-Pack)
Key Features
  • 12TB Storage Capacity per Drive
  • 3.5" Form Factor
  • SATA III 6 Gb/s Interface
  • 256MB Cache
This B&H Kit combines four Seagate 12TB IronWolf Pro 7200 rpm SATA III 3.5" Internal NAS HDDs together for a total storage capacity of 48TB. These drives can serve a variety of functions. Install them in your host system, RAID, or NAS array, or keep them handy in case existing drives need to be replaced.
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Seagate Pro Internal HDD Overview

This B&H Kit combines four Seagate 12TB IronWolf Pro 7200 rpm SATA III 3.5" Internal NAS HDDs together for a total storage capacity of 48TB. These drives can serve a variety of functions. Install them in your host system, RAID, or NAS array, or keep them handy in case existing drives need to be replaced.

High Performance
All-CMR (conventional magnetic recording) portfolio enables consistent, 24/7 performance, allowing users to access data virtually anytime, anywhere.
High Dependability
Up to a 550TB per year workload rating, a 2.5 million hours MTBF, and a limited 5-year warranty for a solid total cost of ownership (TCO).
Peace of Mind with Data Recovery
Seagate provides complimentary Rescue Data Recovery Services for three years, giving users a hassle-free, zero-cost data recovery experience.
IronWolf Health Management
Helps protect data with prevention, intervention, and recovery recommendations to ensure peak system health.
Optimized for NAS
Seagate's AgileArray technology provides dual-plane balancing, time-limited error recovery (TLER), and rotational vibration (RV) sensors to deliver top RAID performance in multi-bay environments.
UPC: 763649176290

Seagate Pro Internal HDD Specs

Key Specs
Total Capacity
12 TB
Drive Type
SATA III / 3.5" HDD (7200 rpm)
Read Speed
Maximum: 270 MB/s
Write Speed
Maximum: 270 MB/s
Total Capacity
12 TB
Drive Type
SATA III / 3.5" HDD (7200 rpm)
Performance
Read Speed
Maximum: 270 MB/s
Write Speed
Maximum: 270 MB/s
Encryption Support
No
Mean Time Between Failures (MTBF)
2.5 Million Hours
Endurance (Total Bytes Written)
550 TB
Electrical
Power Draw
7.8 W (Active)
5.0 W (Idle)
1.0 W (Standby)
Input Power
12 VDC at 2 A
General
Operating Conditions
32 to 97°F / 0 to 65°C
Operating Shock
50 G / 2.0 ms
Storage Conditions
-40 to 158°F / -40 to 70°C
Dimensions
5.79 x 4.01 x 1.03" / 146.99 x 101.85 x 26.11 mm
Weight
1.5 lb / 670 g
Packaging Info
Package Weight
1.715 lb
Box Dimensions (LxWxH)
8.8 x 6.1 x 3"

Seagate Pro Internal HDD Reviews

Great Drives Insane Price

By Noah
Rated 4 out of 5
Date: 2026-07-10

These work perfectly for my Synology. Never had one fail or let me down. That said, the current price is absolutely outrageous. Drives used to get cheaper. The price is double what it cost two years ago. This should make everyone angry.

All Good Now

By Chris
Rated 4 out of 5
Date: 2026-05-02

I ordered four of the 28TB NAS harddrives. Two of them could not be read by my NAS. I tried to inform B&H but unfortunately for me they were off for a week for a holiday. So my NAS had to remain in a compromised state. B&H immediately sent me return authorization and a label and then quickly sent me two replacement drives. I made the wise decision to test the drives prior to disabling a drive in my NAS. Both replacement drives worked fine. I was disappointed in Seagate that two out or four drives did not work out of the box but B&H remedied the situation quickly. Last year I ordered four 16TB Seagate NAS drives from another retailer and one of the four did not work. A little scary Seagate, but for the price, I guess I'll take the chance.

See any errors on this page?

What is the model of these? Similar to ST12000NE0

What is the model of these? Similar to ST12000NE0008-2PK103 ? Is it compatible with Synology 8-bay NAS DS1821+ ?
Asked by: Pablo
The Seagate 12TB IronWolf Pro 7200 rpm SATA III 3.5" Internal NAS HDD (CMR, Retail, 4-Pack) is not compatible with the DS1821+, and only Synology drives are officially supported. Here's a 12TB drive that would work: https://bit.ly/4utaw5v.
Answered by: Elliot A
Date published: 2026-03-17

Is it compatible with QNAP TR-004 4-Bay USB 3.2 ...

Is it compatible with QNAP TR-004 4-Bay USB 3.2 Gen 1 RAID Expansion Enclosure?
Asked by: Kirsten
Yes, the Seagate 12TB IronWolf Pro 7200 rpm SATA III 3.5" Internal NAS HDD (CMR, Retail, 4-Pack) could be used with the QNAP TR-004 4-Bay USB 3.2 Gen 1 RAID Expansion Enclosure (B&H #QNTR004US).
Answered by: Calvin M
Date published: 2024-11-21

Is this compatible with the QNAP TR-004 4-Bay USB ...

Is this compatible with the QNAP TR-004 4-Bay USB 3.2 Gen 1 RAID Expansion Enclosure?
Asked by: Kirsten
The Seagate 12TB IronWolf Pro 7200 rpm SATA III 3.5" Internal NAS HDD (CMR, Retail, 4-Pack) would be compatible with the QNAP TR-004 4-Bay USB 3.2 Gen 1 RAID Expansion Enclosure.
Answered by: Alex D
Date published: 2024-11-21

Will this work in the UGreen NAS

Will this work in the UGreen NAS
Asked by: Alex
Yes, this Seagate 24TB IronWolf Pro 7200 rpm SATA III 3.5" Internal NAS HDD is optimized for installation inside a NAS, including many of the enclosures made by UGreen.
Answered by: Jordan K
Date published: 2025-12-23

Does OWC support these Pro versions in their exte

Does OWC support these Pro versions in their external enclosures, [Merc Elite, Thunderbay] etc without power on/off issues?
Asked by: James
Yes. OWC products like the OWC ThunderBay 4 4-Bay Thunderbolt 3 RAID 5 Enclosure, BH #OWTB3SRKT0GB, https://bit.ly/47tfWUe, do support the Seagate 28TB IronWolf Pro 7200 rpm SATA III 3.5" Internal NAS HDD (CMR), BH #SEST28000NT0.
Answered by: Elchanan P
Date published: 2026-03-30

Is it compatible with DS718+?

Is it compatible with DS718+?
Asked by: Maheswar
The Seagate 24TB IronWolf Pro 7200 rpm SATA III 3.5" Internal NAS HDD (CMR, Retail, 2-Pack), B&H # SEST24000N2K, is not compatible with the DS718+.
Answered by: Miguel M
Date published: 2025-10-16

The Heading is for 48TB, but the Overview says ...

The Heading is for 48TB, but the Overview says "the 24TB IronWolf Pro 7200". Could you please check?
Asked by: Rajnesh
The Seagate IRONWLF PRO 48TB 3.5" 7200RPM SATA HDD, B&H # SEST24000N2K, is a kit that includes two Seagate 24TB IronWolf Pro 7200 rpm SATA III 3.5" Internal NAS HDDs, B&H # SEST24000NT2.
Answered by: Kenneth C
Date published: 2024-07-14

The 20TB version of the HDD is running a little ...

The 20TB version of the HDD is running a little hot, up to +54°C. Is that normal?
Asked by: Rouslan
How can any electronic component have a normal operating temperature of 41 degrees Fahrenheit where normal ambient temperature of the room would be 70 degrees? The cold side of my air conditioner is not that good!
Answered by: Anonymous
Date published: 2026-01-09
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