Seagate
Seagate ST9120821AS 120GB 5400RPM SATA Hard Drive
Reliable Storage for Your Mobile Needs The Seagate Momentus 5400.2 (ST9120821AS) offers dependable storage for laptops and other portable devices. With a capacity of 120GB, a SATA 1.5Gbps interface, and a 5400RPM spin speed, this 2.5-inch internal hard drive delivers a balance of performance and ...
$16.95*
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*Price sourced from Amazon.com. Last updated:Jul 15, 2026.Price and availability are subject to change.
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Overview
Reliable Storage for Your Mobile Needs
The Seagate Momentus 5400.2 (ST9120821AS) offers dependable storage for laptops and other portable devices. With a capacity of 120GB, a SATA 1.5Gbps interface, and a 5400RPM spin speed, this 2.5-inch internal hard drive delivers a balance of performance and storage capacity.Specifications
- Brand: Seagate
- Model: ST9120821AS
- Series: Momentus 5400.2
- Capacity: 120GB
- Interface: SATA 1.5Gbps
- RPM: 5400RPM
- Cache: 8MB
- Form Factor: 2.5-inch
Specifications
Brand
Seagate
Model
ST9120821AS
Capacity
120GB
RPM
5400RPM
Interface
SATA
Type
Hard Drive
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View on Amazon →Pros & Cons
👍 Pros
- Offers a storage capacity of 120GB, suitable for operating systems, essential applications, or data backups.
- Features a 5400RPM spindle speed, which is a standard for many laptop and external hard drives balancing performance and power efficiency.
- Uses a SATA interface, providing widely compatible connectivity with most modern motherboards and enclosures.
- Being a Seagate brand, it benefits from a manufacturer known for producing reliable storage solutions.
- Suitable for upgrading older systems or as an additional storage drive for specific purposes where 120GB is sufficient.
👎 Cons
- The 5400RPM spindle speed is slower than 7200RPM drives or SSDs, which will result in slower boot times and application loading.
- A capacity of 120GB is relatively small by today's standards, potentially limiting its use as a primary drive for many users.
- The SATA interface, while compatible, does not offer the speed advantages of newer NVMe SSD technology.
- No specific details on cache size or shock resistance are provided, which are important factors for hard drive performance and durability.
- This hard drive is likely an older model, and its performance may not meet the expectations of users accustomed to modern storage speeds.
Frequently Asked Questions
What is the storage capacity of this hard drive?
This Seagate hard drive offers a storage capacity of 120GB, suitable for various data storage needs.
What is the spindle speed of this hard drive?
The hard drive operates at a spindle speed of 5400RPM, providing a balance between performance and power consumption.
What type of interface does this hard drive use for connection?
This hard drive utilizes a SATA interface, which is a common and widely compatible connection standard for internal drives.
Is this hard drive designed for desktop or laptop use?
The ST9120821AS model with a 5400RPM speed and 120GB capacity is typically suited for laptop or smaller form-factor PC applications.
What generation of SATA interface does this hard drive support?
The listing specifies a SATA interface, but does not detail the exact generation (e.g., SATA I, SATA II, SATA III). Compatibility should be broad across SATA systems.
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