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Silver 3.5 inch SAS hard drive bare unit

Seagate

Seagate Cheetah NS ST3400755SS 400GB 10000 RPM 16MB SAS 3Gb/s 3.5" internal hard drive

SKU CH-2WJ1-XHXG1 MPN ST3400755SS

A 400 GB 3.5-inch SAS drive spinning at 10000 RPM with 16 MB cache and 3.9 ms average seek time, designed for NAS systems

  • Total capacity400 GB
  • Interface typeSAS 3Gb/s
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Rotational speed10,000 RPM
  • Cache memory16 MB
  • 10000 RPM spindle for fast data access
  • 16 MB cache to smooth burst workloads
  • SAS 3Gb/s interface for direct server attachment
  • 9 ms average seek reduces latency
  • 98 ms rotational latency speeds random I/O

Seagate Cheetah NS 400GB 10000 RPM SAS Drive

This Seagate Cheetah NS ST3400755SS is a 3.5-inch internal hard drive with a 400GB capacity and a 10000 RPM spindle speed. It connects via a SAS 3Gb/s interface and includes a 16MB cache. The drive is supplied as a bare unit and is designated for NAS systems.

Buyers needing SAS 3Gb/s 10K storage

This drive suits NAS deployments and servers that accept a 3.5-inch SAS 3Gb/s device running at 10000 RPM. It is not for systems that lack a SAS backplane or controller. It is also not for users who require a manufacturer warranty, as the product is end-of-sale and covered only by the seller's one-year warranty.

10000 RPM spindle speed decides fit

The 10000 RPM rotation rate determines the drive's average seek time of 3.9ms, average write time of 4.2ms and average latency of 2.98ms. Verify that the target chassis and controller support this speed and the SAS 3Gb/s interface before purchasing.

How it compares

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

Price $172.99
Pricier than about 64% of the 4,938 comparable items (median $107.99).
Total capacity 400 GB
Lower than about 84% of the 2,372 comparable items (median 2 TB).
Price per TB $432.48 per TB
Pricier than about 90% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameSeagate
Product lineCheetah NS
Model nameST3400755SS
Total capacity400 GB
Recommended useFor NAS systems
Performance
Rotational speed10,000 RPM
Average seek time3.9 ms
Mean write time4.2 ms
Mean latency2.98 ms
Storage
Cache memory16 MB
Ports & slots
Interface typeSAS 3Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Max height26.11 mm
Maximum width101.85 mm
Maximum length147 mm
Shipping weight1.36 kg
Package size163 × 124 × 33 mm

Questions about this item

What is the average seek time for the ST3400755SS in a NAS array?

The drive specifies a 3.9ms average seek time and 2.98ms average latency at 10000 RPM.

Which limit appears first during sustained writes on the 400GB SAS drive?

The 3Gb/s SAS interface caps sustained throughput before the 16MB cache or 10000 RPM platters saturate.

How much heat does the 3.5" Cheetah NS generate under continuous operation?

The bare drive measures 147.00mm x 101.85mm x 26.11mm and spins at 10000 RPM with a SAS 3Gb/s interface.

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