Gilles installed a 200GB Hitachi 7K200 2.5" HD in his MacBook Pro (186 GB true storage capacity once formatted). This drive spins at 7200-rpm and first benchmarks illustrate its performance level:
This drive can reach more than 80MB/s data transfer speed (reading mode).
Hereafter is the same test performed with a 250GB Western Digital 2.5" HD spinning at 5400-rpm:
While being already faster than the original HD, the WD model is about 25% slower than the Hitachi 7K200.
Prices of both HD are similar, so the choice will be between higher performance or larger storage capcity.
[translation by Linathael]