The result is a setup that can quickly exceed the maximum bandwidth that SATA can offer. A good controller will be able to have reads/writes in flight to over half of those die in parallel. A 256GB SSD can be made up of 32 independent NAND die, clustered into 8 discrete packages. Not only do solid state drives offer amazingly low access latency, but you can hit amazingly high bandwidth figures by striping accesses across multiple NAND Flash die. Hard drives were rarely quick enough to need more than they were given to begin with, and only after generations of platter density increases would you see transfer rate barriers broken. In the old days, increasing maximum bandwidth supported by your PATA/SATA interface was always ceremonial at first.
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