Seagate ST9120822ASProduct Momentus 5400.3 120 GB 2.5" SATA laptop hard drive

Momentus 5400.3 for mainstream notebooks

This Seagate Momentus 5400.3 drive provides 120 GB of storage in a 2.5 inch form factor. It is built for mainstream notebook PCs and suits non-PC roles such as external storage, printers or non-mission-critical blade servers. The SATA interface makes it a direct fit for laptops that use that connection. Buyers who need higher capacity or faster spindle speeds should look elsewhere.

Fits 2.5 inch SATA bays with 8 MB buffer

The drive uses the SATA/150 interface and a standard 2.5 inch form factor with a 0.4 inch height. An 8 MB buffer helps smooth data transfers during everyday tasks. It requires a system with a compatible SATA port and mounting space for a 2.5 inch drive. Builders working with smaller form factors or different interfaces cannot use this unit.

Steady 5400 rpm operation under load

The spindle runs at 5400 rpm, delivering consistent throughput during sustained read and write sessions rather than short bursts. The 8 MB buffer absorbs typical workload fluctuations in notebook and embedded applications. Performance scales with the SATA/150 link speed and the drive's mechanical characteristics. Users seeking SSD-like latency or higher sustained transfer rates will not find them here.