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Hitachi may be slightly slower at max but may have better average STR (160 vs 171 or is that 163MB/s for seagate).
Hitachi uses slightly higher Gbit/sq.in. probably uses slightly smaller platter (more tracks per inch not more KB/track).
Seagate don't quote different seek times for different platters (3.4/3.9ms for R/W). Hitachi doc claims 3.6ms not 3.3ms. Similar power at peak. Seagate slightly better at idle. Hitachi only offeres full 450GB with new family, Seagate has 300GB and 146GB model using new design.