Western Digital Xe 300 GB

This is a 300GB 3.5" HDD on the SAS 6.0 Gb/s interface. Sequential throughput reaches 550 MB/s reads and 520 MB/s writes, backed by 32MB of cache. At roughly $0.25 per gigabyte it sits in the mid-range tier. Expect to pay around $75.00, which lands it among mid-range options.

Use the PlanMyPC system builder to verify it works alongside your other components and to keep a running tally of the cost. Warranty coverage follows Western Digital's standard policy — confirm regional terms on the listing. Scroll down for the complete spec table; the builder's compatibility checker will warn you about any conflicts with components you have already picked.