Hitachi Ultrastar 7K6000 4 TB

This is a 4000GB 3.5" HDD on the SAS 12.0 Gb/s interface. Sequential throughput tops out at 550 MB/s reads and 520 MB/s writes, backed by 128MB of cache. At roughly $0.04 per gigabyte it sits in the high-end tier. Expect to pay around $179.99, which lands it among high-end options.

Use the PlanMyPC system builder to verify it works alongside your other components and to watch live retailer pricing. Warranty coverage follows Hitachi'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.