What does this test session sum up to? First off, the Hitachi is a highly specific product. It is oriented at server (more specifically, multithreaded) loads and is utterly hopeless under loads typical of desktop PCs.
Western Digital’s HDDs get all of our praise. They are excellent in server tests, win PCMark, perform nicely under multithreaded loads, and rout their opponents in the defragmentation and WinRAR tests.