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Silver 3.5-inch bare drive with exposed circuit board and SAS connector

Seagate

Seagate ST6000NM0205 6TB 7200 RPM 4Kn SAS 256MB internal hard drive

SKU CH-A6GC-7X7JK MPN ST6000NM0205

A 6 TB, 7200 RPM enterprise hard drive with 12 Gb/s SAS interface, 256 MB cache and CMR technology for 24×7 bulk-data workloads

  • Total capacity6 TB
  • Interface type4Kn SAS
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Rotational speed7,200 RPM
  • Cache memory256 MB
  • 6TB capacity stores vast enterprise datasets
  • 7200 RPM spindle delivers responsive bulk-data throughput
  • 256MB cache accelerates random write performance
  • 12Gb/s SAS interface integrates into RAID arrays
  • Engineered for 24×7 workloads of 550TB/yr

Enterprise Capacity for Bulk Data

The Seagate ST6000NM0205 is a 6TB 3.5-inch internal hard drive built for enterprise storage servers and arrays. It uses conventional magnetic recording (CMR) technology to deliver consistent performance in replicated and RAID multi-drive systems. The drive is engineered for continuous 24x7 operation with a workload rating of 550TB per year. It targets administrators who need high-capacity, reliable storage for unstructured bulk data applications.

12Gb/s SAS Interface Limits

The drive connects via a 12Gb/s SAS interface in 4Kn format, also supporting SATA 6Gb/s and 512n or 512e sector sizes. This interface caps the maximum sustained transfer rate at the bus speed, so sequential throughput cannot exceed the 12Gb/s link bandwidth. Random write performance benefits from Advanced Write Caching algorithms, but the SAS bus remains the hard ceiling for all I/O. Systems without a 12Gb/s SAS host adapter or backplane will not realise the full interface potential.

6TB Cache and Workload Headroom

A 256MB cache buffers bursts and improves random write efficiency up to 100% over the previous generation. The 6TB capacity suits bulk archives, backup targets and nearline storage tiers where capacity per slot is the priority. The 550TB annual workload rating defines the comfortable operating envelope; sustained write loads beyond this level risk reduced reliability. The drive is not suited for primary high-IOPS transactional databases or low-latency boot volumes.

How it compares

Measured against everything we stock in 3.5-Inch Internal Desktop HDDs, at today’s prices. Recalculated every night.

Price $196.99
Pricier than about 68% of the 4,938 comparable items (median $107.99).
Total capacity 6 TB
Higher than about 75% of the 2,372 comparable items (median 2 TB).
Price per TB $32.83 per TB
Cheaper than about 79% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Model nameST6000NM0205
Total capacity6 TB
Recommended useFor Enterprise Storage
Performance
Rotational speed7,200 RPM
Mean latency4.16 ms
Storage
Cache memory256 MB
Ports & slots
Interface type4Kn SAS
Size & build
Form factor3.5 in (8.89 cm)
Max height26.1 mm
Maximum width101.85 mm
Maximum length147 mm
Shipping weight1.06 kg
Package size413 × 305 × 108 mm

Questions about this item

How do I choose between the 512n, 512e and 4Kn versions of this 6TB drive?

This model is the 4Kn version, meaning it uses 4K native sectors and requires a host controller and operating system that support 4Kn addressing; choose 512n or 512e only if your system cannot handle 4Kn.

What does the 7200 RPM speed mean for real-world throughput on a 12Gb/s SAS link?

The 7200 RPM spindle delivers sustained sequential transfers that typically saturate a single 12Gb/s SAS lane, while the 256MB cache and Advanced Write Caching absorb bursty random writes.

Does the 12Gb/s SAS interface also run at SATA 6Gb/s, and what limits the speed in practice?

The drive supports both 12Gb/s SAS and SATA 6Gb/s; the active speed is negotiated with the host controller, so a SATA backplane caps the link at 6Gb/s while a SAS expander allows the full 12Gb/s rate.

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