Seagate
Seagate Momentus 7200.3 ST9250421AS 250GB 7200 RPM 16MB SATA 3.0Gb/s 2.5" laptop hard drive
A 2.5-inch laptop hard drive with 250GB capacity, 7200 RPM speed and 16MB cache over a SATA 3.0Gb/s interface
- PackagingBare Drive
- InterfaceSATA 3.0Gb/s
- Capacity250GB
- Cache16MB
- Average Latency4.17ms
- RPM7200 RPM
- 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.
Highlights
- 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
Specifications
| Brand | Seagate |
|---|---|
| Series | Momentus 7200.3 |
| Model | ST9250421AS |
| Packaging | Bare Drive |
| Interface | SATA 3.0Gb/s |
| Capacity | 250GB |
| Cache | 16MB |
| Average Latency | 4.17ms |
| RPM | 7200 RPM |
| Form Factor | 2.5" |
| Shipping weight | 0.11 kg |
| Package size | 140 × 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.
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