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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

  • Total capacity6 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Cache memory128 MB
  • Max height26.11 mm

Capacity 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.

How it compares

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

Price $177.99
Pricier than about 65% 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 $29.67 per TB
Cheaper than about 83% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Product lineNAS HDD
Model nameST6000VN0021
Total capacity6 TB
Recommended useFor NAS systems
Storage
Cache memory128 MB
Ports & slots
Interface typeSATA 6.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Max height26.11 mm
Maximum width101.6 mm
Maximum length146.99 mm
Shipping weight0.82 kg
Package size146 × 102 × 25 mm

Other versions of this model

2 more in the same range

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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