David I believe you can still format these drives normally (512K). I don't have any but recall reading about advance format. WD drives have/had a jumper to enable it as well. But if you are using XP, older Mac or *nix it is not supported natively.
Since media files are usually large files there is a potential for reduced overhead. But I admit I don't know all the details .... yet.
Essentially they are using 4Kb sectors instead of the current 512 byte sectors. Long story short, with higher capacity drives, the storage system needs to be more efficient as they storage medium becomes more dense. This density is required for the large capacities. Problem with older OSes (as Jake pointed out) is that they don't properly align the sectors, causing huge performance decreases.
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