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Silver rectangular 2.5 inch bare hard drive with circuit board visible

Seagate

Seagate ST940817AM 40GB 5400 RPM 8MB PATA 2.5" laptop hard drive

SKU CH-0GGW-V0K6Q MPN ST940817AM

40 GB 2.5-inch PATA laptop drive rated for extreme temperatures and high shock

  • Total capacity40 GB
  • Interface typePATA
  • Form factor2.5 in (6.35 cm)
  • Packaging typeBare Drive
  • Cache memory8 MB
  • Mean latency5.6 ms
  • Reliable storage in extreme temperatures with RunOn Technology
  • 40GB capacity for essential laptop data
  • 5400 RPM spindle speed for consistent performance
  • 8MB cache improves data access times
  • PATA interface fits compatible legacy laptops

Seagate EE25.2 Series 40GB PATA drive

The Seagate ST940817AM is a new 40GB 2.5-inch laptop hard drive from the EE25.2 Series. It uses a PATA interface and spins at 5400 RPM with an 8MB cache. Designed with RunOn Technology, it targets industrial or embedded systems needing operation in extreme temperatures and high vibration or shock environments.

PATA 2.5-inch bare drive integration

This bare drive fits a standard 2.5-inch PATA bay and requires a compatible host controller to function. It draws power directly from the system and needs no separate adapter beyond the standard 44-pin connector. The drive frees up space in compact chassis where a 3.5-inch unit cannot fit and its rugged design reduces the need for additional shock mounting hardware.

40GB capacity with 5.6ms latency

The 40GB capacity suits lightweight operating systems, firmware images, or small data logs in embedded appliances. The 5.6ms average latency and 5400 RPM spindle deliver consistent access for sequential workloads. It runs out of headroom for modern multimedia libraries, large databases, or applications demanding high random IOPS or transfer rates beyond the PATA bus.

How it compares

Measured against everything we stock in 2.5-Inch Internal Laptop HDDs, at today’s prices. Recalculated every night.

Price $100.99
Pricier than about 66% of the 645 comparable items (median $66.99).
Total capacity 40 GB
Lower than about 97% of the 419 comparable items (median 320 GB).
Price per TB $2,524.75 per TB
Pricier than about 91% of the 416 comparable items (median $233.48 per TB).

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Specifications

Product
Brand nameSeagate
Product lineEE25.2 Series
Model nameST940817AM
Total capacity40 GB
Performance
Mean latency5.6 ms
Rotational speed5,400 RPM
Storage
Cache memory8 MB
Ports & slots
Interface typePATA
Size & build
Form factor2.5 in (6.35 cm)
Shipping weight0.09 kg
Package size102 × 70 × 13 mm

Questions about this item

Will the 5400 RPM spindle and 8 MB cache become the bottleneck during long write sessions?

The 5400 RPM spindle and 8 MB cache set the sustained throughput ceiling; under continuous writes the mechanical latency of 5.6 ms and the small buffer will be the first limits you hit.

How much heat and noise should I expect from the EE25.2 Series drive running 24/7 in a laptop?

The 2.5 inch 5400 RPM mechanism produces modest heat and low acoustic output; RunOn Technology lets it tolerate extreme temperatures and vibration without extra cooling.

Does my laptop need a 44-pin PATA connector and a 2.5 inch bay for this bare drive to work?

Yes — the drive uses a 44-pin PATA interface and a standard 2.5 inch form factor, so the host must provide that connector and a matching drive bay.

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