We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Silver 2.5 inch laptop hard drive bare unit

Seagate

Seagate Momentus 7200.3 ST9250421AS 250GB 7200 RPM 16MB SATA 3.0Gb/s 2.5" laptop hard drive

SKU CH-EVEM-JTJJS MPN ST9250421AS

A 2.5-inch laptop hard drive with 250GB capacity, 7200 RPM speed and 16MB cache over a SATA 3.0Gb/s interface

  • Total capacity250 GB
  • Interface typeSATA 3.0Gb/s
  • Form factor2.5 in (6.35 cm)
  • Packaging typeBare Drive
  • Cache memory16 MB
  • Mean latency4.17 ms
  • 7200 RPM spindle speed for faster data access
  • 16MB cache buffer to smooth burst workloads
  • SATA 3.0Gb/s interface for broad laptop compatibility
  • 250GB capacity in a 2.5 inch form factor
  • 17ms average latency for responsive performance

250GB 7200 RPM laptop drive

This Seagate Momentus 7200.3 model ST9250421AS is a 2.5 inch internal hard drive with 250GB capacity, 7200 RPM spindle speed and 16MB cache. It connects via a SATA 3.0Gb/s interface and ships as a bare drive. The average latency is 4.17ms.

Suits older laptop upgrades

It suits owners of legacy notebooks that accept a 2.5 inch SATA drive and need a mechanical disk with 7200 RPM performance. Buyers who want solid-state speed, larger capacities or a newer interface should look at something else.

SATA 3.0Gb/s interface decides fit

The single specification that decides whether this is the right part is the SATA 3.0Gb/s interface; the drive will only work in systems that provide a matching SATA connector and support 2.5 inch form factor.

How it compares

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

Price $43.99
Cheaper than about 75% 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 $175.96 per TB
Cheaper than about 60% of the 416 comparable items (median $233.48 per TB).

New to this? Paying with USDT: TRC-20 or ERC-20 — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameSeagate
Product lineMomentus 7200.3
Model nameST9250421AS
Total capacity250 GB
Performance
Mean latency4.17 ms
Rotational speed7,200 RPM
Storage
Cache memory16 MB
Ports & slots
Interface typeSATA 3.0Gb/s
Size & build
Form factor2.5 in (6.35 cm)
Shipping weight0.11 kg
Package size140 × 102 × 11 mm

Questions about this item

Will the 2.5" ST9250421AS fit my laptop's internal drive bay?

The drive uses the standard 2.5" form factor and SATA 3.0Gb/s interface found in most laptop bays. Verify your system accepts a 7200 RPM SATA drive before purchasing.

What is the correct way to install this bare SATA drive, and what step is often missed?

Connect the SATA data and power cables firmly, then secure the drive with the chassis screws. A common oversight is leaving the drive unmounted, which causes vibration errors at 7200 RPM.

When should I expect to replace the 250GB Momentus 7200.3 drive in a daily-use laptop?

Mechanical drives at 7200 RPM typically show wear after three to five years of daily use. Monitor SMART reallocated-sector counts and replace the drive once errors appear.

More in 2.5-Inch Internal Laptop HDDs

Similar items