Consumers (home and business) for the most part buy the bulk of their 
storage on $/GB type of decisions. Buying multiple lower capacity HDDs 
does not meet this model.
The 2.5" and 3.5" form factors are such an embedded standard that making 
your drives a different size to get more platter area is not realistic.
Getting greater effective areal density means either more technology in 
the R/W heads and platter, or more efficient use of the existing space. 
Increasing the areal density through technology, while obviously a 
continuing focus of HDD companies, is getting prohibitively more 
expensive with each small advance due to real limitations of physics.
That takes us back to more efficient use of the space, and that is what 
4k sectors gets us.

<http://www.anandtech.com/Show/Index/2888>
"One estimate for 4K sector technology puts this at 100 bytes of ECC 
data needed for a 4K sector, versus 320 (40x8) for 8 512B sectors.  
Furthermore the larger sectors means that larger erroneous chunks of 
data can be corrected (burst error correction), something that was 
becoming harder as greater areal densities made it easier to wipe out 
larger parts of a 512B sector. As a result, the need for the larger 
sector is born."


On 4/10/11 1:59 PM, Michael B. Brutman wrote:
> The move to 4K sector sizes has very good technical reasons behind it.
> It's not the end of the world.
>


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