The 2TB Samsung F4 are using 666GB platters at 5400rpm; though you probably want a disk at 7200rpm right?
It would be interesting to add that 7200rpm, these days, is not the preferred choice for performance anymore. The problem is: all HDDs kind of suck for any random I/O performance; common on your system disk where Windows is installed. Windows 7 has optimizations for harddrives making them feel faster; SuperFetch is particular. But still, no HDD will ever touch an SSD.
My point is this: 7200rpm adds 25% faster sequential I/O and 25% faster seeks (not always true; only the rotational delay is shorter) compared to a 5400rpm drive with the same areal density and firmware. Sounds like a good deal right?
Well not quite, since lower rpm disks generally have higher areal density; 666GB and 750GB platters first arrive on 4200rpm/5400rpm disks, before there 7200rpm models available with this platter capacity. So they 'lag behind'; this makes the sequential performance be almost equal to that of higher density 5400rpm disks of the same generation. All that's left, is the 25% faster seeks. But with SSDs giving you many thousands of percent faster random I/O performance ("seeks" on HDDs) - this argument is not a strong one.
My recommendation is to separate your data: active data like OS/applications/scratch disk should be on your high-performance storage: SSD. Your passive data like movies/music/archives should be on 5400rpm HDDs with high areal density instead. These types of files are accessed sequentially and thus 5400rpm would be just as fast as modern 7200rpm disks; even beating older generation 10.000rpm Velociraptor. They are also very cheap for the large storage they offer, making them ideal for mass storage.
So the real recommendation is not to use 7200rpm for your system disk needs anymore, but rather a small SSD + 5400rpm HDDs. You may just prefer a 'normal 7200rpm' disk without SSD though; though keep in mind even a 30 or 40GB value SSD can give you most of these benefits already. Either way, your alternative would be the a 500GB platter 7200rpm drive; Samsung F3, WD Blue/Black, etc.
