Reviews of the Seagate ST9640322AS Hard Drive. Seagate ST9640322AS—a storage device that belongs to a specific era and occupies a distinct position in the market. Whether this is a brand-new mainstream drive or a decades-old retro component, our goal remains the same: to evaluate it fairly within its intended context. We will examine its physical specifications, interface compatibility, real-world transfer performance, acoustic behavior, thermal output, and long-term reliability considerations.
The Seagate ST9640322AS is a 2.5-inch internal hard disk drive (HDD) designed for mobile computing and external storage applications. It targets users needing cost-effective bulk storage without requiring high-speed data access, fitting into older laptops, portable enclosures, and basic backup solutions. The drive employs a 5400 RPM spindle speed and a SATA 3.0 Gb/s interface, prioritizing capacity and power efficiency over performance.
Core specifications include a formatted capacity of 640 GB, a 16 MB cache buffer, and a single-platter design to reduce weight and power consumption. The drive features a typical operating power draw of around 2.0 Watts and an idle power of 0.6 Watts, making it suitable for battery-sensitive portable devices. Its physical dimensions are standard 9.5mm height, ensuring compatibility with most laptop bays.
Performance-wise, the ST9640322AS achieves sustained sequential read and write speeds averaging between 65 MB/s and 85 MB/s, with burst speeds limited by the SATA II interface. Random access times hover around 14-18 milliseconds, which is typical for 5400 RPM drives. In real-world usage, it handles file transfers for media libraries and document storage adequately but exhibits noticeable delays when loading large uncompressed video files or running multiple applications simultaneously.
The primary advantage of this drive is its reliable, low-cost storage capacity per gigabyte, combined with low noise output and minimal heat generation during operation. It is a good drop-in replacement for aging, smaller drives in legacy systems lacking SSD support. However, its weaknesses are significant: very poor random read/write performance, a 3 Gb/s bottleneck limiting burst data rates, and mechanical fragility compared to modern solid-state drives, making it unsuitable for high-performance tasks or rough physical environments.
Typical use cases for the Seagate ST9640322AS include secondary bulk storage in desktop computers, media archiving, and use as an internal drive in low-cost netbooks or older laptops where speed is not critical. It also works well in external USB 2.0 or USB 3.0 enclosures for backing up large files, as the interface speed matches the drive’s throughput without creating a storage bottleneck.
For purchasing, this model is now obsolete and largely available only in the used or refurbished market. If considering it for a legacy system, ensure the SATA connector is compatible (SATA II or SATA I) and verify the drive is not heavily worn by checking SMART data. Current pricing should be very low, typically under $15 USD, and buyers should expect a significantly shorter lifespan than modern drives. For similar capacity needs with newer technology, a modern 2.5-inch 5400 RPM HDD like the Seagate Barracuda or WD Blue offers better reliability and slightly improved performance, while any SSD will dramatically outperform this model.