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Silver 2.5 inch bare hard drive with green circuit board visible

Seagate

Seagate ST940818AM 40GB 5400 RPM 8MB Cache PATA 2.5" laptop hard drive

SKU CH-NDND-G3FC4 MPN ST940818AM

40 GB PATA laptop drive built for extreme temperatures, vibration and shock

  • Total capacity40 GB
  • Interface typePATA
  • Form factor2.5 in (6.35 cm)
  • Packaging typeBare Drive
  • Cache memory8 MB
  • Mean latency5.6 ms
  • Rugged EE25.2 Series handles extreme temperatures and vibration
  • 40GB capacity stores essential data for embedded applications
  • 5400 RPM spindle speed with 8MB cache provides steady throughput
  • 5-inch form factor fits standard laptop and industrial drive bays
  • PATA interface connects directly to legacy motherboard controllers

Rugged PATA laptop drive

The Seagate ST940818AM is a 40GB 2.5-inch internal hard drive built for rugged environments. It uses a PATA interface and runs at 5400 RPM with an 8MB cache. RunOn Technology enables operation in extreme temperatures and high vibration or shock conditions. This new bare drive suits industrial, automotive and defence applications.

Fit for harsh conditions, not for modern laptops

Engineers maintaining legacy industrial control systems, military equipment or ruggedised laptops will find the correct interface and form factor here. Builders working on current consumer laptops should look elsewhere because those machines no longer support PATA connections. The drive also does not suit users who need more storage capacity than 40GB.

PATA interface decides compatibility

The single specification that determines whether this is the right part is the PATA interface. Only systems with a native PATA controller can install this drive. Verify the host interface before purchase.

How it compares

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

Price $140.99
Pricier than about 76% 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 $3,524.75 per TB
Pricier than about 92% of the 416 comparable items (median $233.48 per TB).

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Specifications

Product
Brand nameSeagate
Product lineEE25.2 Series
Model nameST940818AM
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 weight0.23 kg
Package size152 × 102 × 25 mm

Questions about this item

How do I install this 2.5" PATA drive and which jumper setting is the step people get wrong?

Fit the drive into the 2.5" bay, connect the 44-pin PATA ribbon and set the jumper to Master or Cable Select; the common mistake is leaving it in the default Slave position.

What maintenance or replacement will this ST940818AM need later?

No routine maintenance is required; replace the drive if SMART reports reallocated sectors or if the 5400 RPM spindle develops bearing noise after extended use.

What limit shows up first on this EE25.2 Series drive under sustained write loads?

The 8 MB cache fills quickly, so sustained throughput drops to the native 5400 RPM media rate once the buffer is exhausted.

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