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Silver 3.5-inch bare hard drive with green circuit board visible underneath

Seagate

Seagate ST4000NM0125 4TB 7200 RPM 512e SAS 128MB 3.5" internal hard drive

SKU CH-1FYR-4DM71 MPN ST4000NM0125

A 4 TB enterprise hard drive with 7200 RPM, 128 MB cache and 12 Gb/s SAS for 24×7 bulk-data workloads

  • PackagingBare Drive
  • Interface512e SAS
  • Capacity4TB
  • NAND Flash Memory TypeHard Drive
  • RPM7200 RPM
  • Cache128MB

Options 4TB

Struck-through versions exist but are not stocked here.

  • 4TB capacity stores bulk enterprise data
  • 7200 RPM spindle delivers consistent nearline performance
  • 128 MB cache accelerates random I/O workloads
  • 12 Gb/s SAS interface enables dual-port redundancy
  • 550 TB/year workload rating supports 24×7 operation

Capacity and Interface

This 4 TB enterprise hard drive uses a 12 Gb/s SAS interface with 512e formatting and conventional magnetic recording technology. It is built for 24×7 bulk-data workloads such as replicated storage servers, RAID arrays and high-capacity nearline archives.

Host Compatibility

Verify that your server or storage enclosure provides a SAS 12 Gb/s backplane or controller with 512e sector support. The drive requires a standard 3.5-inch drive bay and draws power from the system backplane rather than a separate connector.

Thermals and Power

The drive is engineered for continuous operation in dense multi-drive chassis with a rated workload of 550 TB per year. Dual processors, ramp-load technology and a humidity sensor maintain stable performance and reliability under sustained enterprise loads.

Highlights

  • 4TB capacity stores bulk enterprise data
  • 7200 RPM spindle delivers consistent nearline performance
  • 128 MB cache accelerates random I/O workloads
  • 12 Gb/s SAS interface enables dual-port redundancy
  • 550 TB/year workload rating supports 24×7 operation

Specifications

BrandSeagate
ModelST4000NM0125
PackagingBare Drive
Interface512e SAS
Capacity4TB
NAND Flash Memory TypeHard Drive
RPM7200 RPM
Cache128MB
Average Latency4.16ms
FeaturesCapacity-Optimized Enterprise Hard Drive for Bulk-Data Applications
- 1TB to 8TB*1, 3.5-inch enterprise drive with industry-leading conventional magnetic recording (CMR) technology
- Advanced Write Caching feature enables up to 100% performance improvement in random writes over last-generation drive
- 12Gb/s SAS and SATA 6Gb/s interfaces in industry-standard formats (512n, 512e and 4Kn) for easy integration into replicated and RAID multi-drive storage servers and systems
- State-of-the-art cache, on-the-fly error-correction algorithms, super parity and end-to-end SAS-based data integ
UsageFor Enterprise Storage
Form Factor3.5"
Height (maximum)26.10mm
Width (maximum)101.85mm
Length (maximum)147.00mm
Shipping weight0.69 kg
Package size168 × 146 × 3 mm

Other versions of this model

2 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

What comes in the box with the ST4000NM0125, and do I need to buy cables or a mounting bracket separately?

The drive is supplied as a bare 3.5" unit only. A SAS data cable, a compatible power connector and any mounting hardware for your chassis must be sourced separately.

Should I choose the 512e SAS version or look for a 512n or 4Kn model for my RAID array?

The 512e format emulates 512-byte sectors on 4K physical sectors, giving broad compatibility with most RAID controllers and operating systems while keeping the 4TB capacity.

How does the 12Gb/s SAS interface and 7200 RPM speed translate to real-world throughput in a 24×7 server?

The 12Gb/s SAS link and 128MB cache support sustained sequential transfers that match the 7200 RPM mechanical limit, while the 550TB/yr workload rating and 4.16ms latency are engineered for continuous multi-drive operation.

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