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Silver rectangular 2.5 inch bare hard drive with circuit board visible

Seagate

Seagate Momentus 5400.6 ST9250315AS 250GB 5400 RPM 8MB Cache SATA 3.0Gb/s 2.5" laptop hard drive

SKU CH-4BC4-3FEK0 MPN ST9250315AS

2.5-inch SATA internal hard drive with 250 GB capacity, 5400 RPM speed and 8 MB cache for laptop storage upgrades

  • Total capacity250 GB
  • Interface typeSATA 3.0Gb/s
  • Form factor2.5 in (6.35 cm)
  • Packaging typeBare Drive
  • Cache memory8 MB
  • Mean latency5.6 ms
  • 250 GB capacity stores large media libraries and documents
  • 5400 RPM spindle speed delivers responsive everyday performance
  • 8 MB cache buffer accelerates frequent data access
  • SATA 3.0 Gb/s interface connects directly to laptop motherboards
  • 1000 Gs non-operating shock rating protects data during transport

250 GB SATA laptop drive

The Seagate Momentus 5400.6 ST9250315AS is a 2.5 inch internal hard drive with 250 GB capacity and a 5400 RPM spindle. It connects through a SATA 3.0Gb/s interface and includes 8 MB of cache. The bare drive suits notebook upgrades or industrial installations where a standard height 9.5 mm form factor is required. Buyers who need higher capacities or faster interfaces should consider other options.

Thermals noise and power

QuietStep technology reduces acoustic output during data access for a quieter working environment. The 5400 RPM rotation speed generally limits heat generation compared with faster spindle drives. Average latency is 5.6 ms. No specific power-draw figures are supplied in the data.

Shock protection and recording tech

Perpendicular Magnetic Recording increases data density while reducing moving parts for enhanced reliability. The drive withstands up to 1000 Gs of non-operating shock, and G-Force Protection adds robustness in mobile environments. Ramp load technology removes the head from the disk surface during idle periods to further protect stored data.

How it compares

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

Price $38.99
Cheaper than about 81% of the 645 comparable items (median $66.99).
Total capacity 250 GB
Lower than about 64% of the 419 comparable items (median 320 GB).
Price per TB $155.96 per TB
Cheaper than about 66% of the 416 comparable items (median $233.48 per TB).

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Specifications

Product
Brand nameSeagate
Product lineMomentus 5400.6
Model nameST9250315AS
Total capacity250 GB
Performance
Mean latency5.6 ms
Rotational speed5,400 RPM
Storage
Cache memory8 MB
Ports & slots
Interface typeSATA 3.0Gb/s
Size & build
Form factor2.5 in (6.35 cm)
Max height9.5 mm
Maximum width69.75 mm
Maximum length100.3 mm
Overall height30 DAY WARRANTY
Shipping weight0.10 kg
Package size102 × 71 × 13 mm
More details
Variant30 DAY WARRANTY

Questions about this item

How do I install the 2.5" 9.5mm SATA drive in my laptop, and what step is often missed?

Slide the drive into the 2.5" bay, secure it with the four mounting screws, then attach the SATA data and power connectors; the step often missed is tightening the screws evenly so the 9.5mm height seats flush without stressing the connector.

What maintenance or replacement will the ST9250315AS need over time?

No routine maintenance is required; the 5400 RPM mechanism and 8MB cache are sealed, so the only future action is replacing the drive if SMART attributes report reallocated sectors or the 250GB capacity becomes insufficient.

What limit appears first during sustained transfers on this SATA 3.0Gb/s drive?

The 5400 RPM spindle speed and 8MB cache constrain sustained throughput well below the 3.0Gb/s interface ceiling, so mechanical latency becomes the bottleneck during long sequential reads or writes.

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