Seagate
Seagate Momentus 7200.2 ST9100821AS 100GB 7200 RPM 8MB SATA 3.0Gb/s 2.5" laptop hard drive
A 2.5" SATA laptop drive with 100GB capacity, 7200 RPM speed and 8MB cache
- PackagingBare Drive
- InterfaceSATA 3.0Gb/s
- Capacity100GB
- Cache8MB
- Average Latency4.17ms
- RPM7200 RPM
- 7200 RPM spindle speed delivers faster data access
- 100GB capacity stores operating system and essential files
- SATA 3.0Gb/s interface ensures broad laptop compatibility
- 8MB cache buffers bursts for smoother multitasking
- Low power consumption extends battery runtime per charge
100 GB 2.5″ SATA laptop drive
The Seagate Momentus 7200.2 ST9100821AS is a 100 GB internal hard drive built for 2.5″ laptop bays. It spins at 7200 RPM with an 8 MB cache and connects through a SATA 3.0 Gb/s interface. The bare-drive unit uses perpendicular recording for data reliability and draws low power to extend battery runtime.
Upgrade seekers and capacity limits
This drive suits owners replacing a failed 2.5″ SATA drive or adding modest storage to an older notebook that accepts the 3.0 Gb/s link. It does not meet the needs of users who require more capacity than 100 GB or who need a 6 Gb/s SATA connection for newer platforms.
SATA 3.0 Gb/s interface
The single specification that decides fitment is the SATA 3.0 Gb/s interface. The drive will operate only in systems that provide a matching SATA data and power connector for 2.5″ devices.
Highlights
- 7200 RPM spindle speed delivers faster data access
- 100GB capacity stores operating system and essential files
- SATA 3.0Gb/s interface ensures broad laptop compatibility
- 8MB cache buffers bursts for smoother multitasking
- Low power consumption extends battery runtime per charge
Specifications
| Brand | Seagate |
|---|---|
| Series | Momentus 7200.2 |
| Model | ST9100821AS |
| Packaging | Bare Drive |
| Interface | SATA 3.0Gb/s |
| Capacity | 100GB |
| Cache | 8MB |
| Average Latency | 4.17ms |
| RPM | 7200 RPM |
| Features | Native Command Queuing (NCQ) Low power consumption maximizes battery life and lets users work longer. Perpendicular recording technology enhances data reliability. |
| Form Factor | 2.5" |
| Shipping weight | 0.09 kg |
| Package size | 102 × 102 × 13 mm |
Questions about this item
What does the 7200 RPM speed mean for everyday laptop use?
The spindle spins at 7200 RPM with an average latency of 4.17ms, so the drive can locate data faster than slower-spinning notebook drives.
How does the SATA 3.0Gb/s interface affect real-world transfer rates?
The SATA 3.0Gb/s link caps the burst transfer ceiling at 3.0Gb/s; sustained reads and writes will be lower and depend on the 7200 RPM platters and 8MB cache.
Will this 2.5" bare drive fit my laptop's drive bay and caddy?
It uses the standard 2.5" form factor, so it mounts in any notebook bay or caddy designed for 2.5" SATA drives.
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