Western Digital Caviar Green 640 GB

This is a 640GB 3.5" HDD on the SATA interface. At roughly $0.05 per gigabyte it sits in the budget tier. Sequential throughput reaches 550 MB/s reads and 520 MB/s writes, backed by 32MB of cache. SATA throughput caps near 550 MB/s — fine for game libraries and backups, slower for heavy scratch work.

Expect to pay around $34.36, which lands it among budget options. Use the PlanMyPC system builder to verify it works alongside your other components and to watch live retailer pricing. Western Digital backs the product through its standard warranty channels; check the listing for region-specific terms.