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Silver 3.5-inch bare hard drive with exposed circuit board

Seagate

Seagate NAS HDD ST6000VN0021 6TB 128MB SATA 6.0Gb/s 3.5" internal hard drive

SKU CH-S3SG-Y8X4K MPN ST6000VN0021

6 TB internal hard drive for 1‑to‑8‑bay NAS systems with 128 MB cache, SATA 6.0 Gb/s interface and 180 TB/year workload rating

  • PackagingBare Drive
  • InterfaceSATA 6.0Gb/s
  • Capacity6TB
  • Cache128MB
  • FeaturesUltra-Reliable 8TB Drives for NAS, Cloud, Servers and RAID -
  • UsageFor NAS systems

Options 6TB

  • 6TB capacity stores large NAS data sets
  • 128MB cache speeds up frequent read operations
  • SATA 6.0Gb/s interface fits standard NAS bays
  • 180TB per year workload rating supports 24x7 operation
  • 5 inch form factor matches common NAS drive slots

NAS-optimised 6 TB storage

The Seagate NAS HDD ST6000VN0021 is a 3.5-inch internal hard drive built for 1- to 8-bay network-attached storage systems. It delivers 6 TB of capacity with a 128 MB cache over a SATA 6.0Gb/s interface and is rated for continuous 24x7 operation.

Fits standard 3.5-inch bays with SATA power and data

The drive measures 146.99 mm long, 101.60 mm wide and 26.11 mm high, so it slides into any desktop or NAS chassis that accepts a 3.5-inch form factor. Dual-plane balance and NASWorks vibration tolerance reduce emissions in multi-drive enclosures, while advanced power management offers low-power profiles that free thermal headroom for other components.

Replaces smaller or desktop-class drives in RAID

With a 180 TB/year workload rate limit and NAS-specific error recovery controls, this model withstands heavy write cycles that would wear out standard desktop drives. The upgrade is worthwhile when your current volumes approach capacity limits or when rebuild times become a risk; it is not suited for boot-only SSDs or single-drive external enclosures.

Highlights

  • 6TB capacity stores large NAS data sets
  • 128MB cache speeds up frequent read operations
  • SATA 6.0Gb/s interface fits standard NAS bays
  • 180TB per year workload rating supports 24x7 operation
  • 5 inch form factor matches common NAS drive slots

Specifications

BrandSeagate
SeriesNAS HDD
ModelST6000VN0021
PackagingBare Drive
InterfaceSATA 6.0Gb/s
Capacity6TB
Cache128MB
FeaturesUltra-Reliable 8TB Drives for NAS, Cloud, Servers and RAID
- 8, 6, 5, 4, 3, 2 and 1TB capacity options.
- Seagate NAS HDDs are built and tested to provide industry-leading performance for small NAS systems.
- NASWorks technology supports customized error recovery controls, power management and vibration tolerance for optimal performance and reliability with workloads up to 180TB/year workload rate limit (WRL).
- NAS error recovery controls optimize drive health by helping to ensure drives are not dropped from the NAS and sent into a RAID rebuild.
- Improved vibration tolerance and em
UsageFor NAS systems
Form Factor3.5"
Height (maximum)26.11mm
Width (maximum)101.60mm
Length (maximum)146.99mm
Shipping weight0.82 kg
Package size146 × 102 × 25 mm

Other versions of this model

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Questions about this item

How much data can I write to this 6 TB NAS drive each year before I hit the workload rate limit?

The drive is rated for workloads up to 180 TB per year, so sustained writes beyond that level may reduce long-term reliability.

What noise level and heat should I expect when the ST6000VN0021 runs 24/7 in a multi-bay enclosure?

It uses dual-plane balance for improved vibration tolerance and advanced power management with multiple low-power profiles to keep noise and heat low during continuous operation.

Does this bare drive need a specific NAS controller or RAID card to work, or will any SATA port do?

It connects via standard SATA 6.0 Gb/s and is designed for 1- to 8-bay NAS systems, so any compatible SATA backplane or controller that supports 3.5-inch drives will work.

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