JNB :
Wow, so the only reason sata 3 is there is for the ssds?
Well the interface speeds are constantly getting better and better, which is good in many ways, it paves the way for faster drives. But mechanical drives have just about reached their limits as far as how fast they can physically transfer the data, because, unlike the "interface" which is 100% transistor in operation with no moving parts, mechanical drives use spinning platters and a moving read/write head. But, mechanical drives do have a memory buffer, which allows for the system to preftech data and store it into the cache, or as a place for incoming data to buffer until the drive can catch up, so to speak, which results in very fast or high "burst" rates for a few milliseconds. So, even though the drive may be way slower than the interface, that high interface speed is still desirable for certain operations, if only under certain circumstances, for very brief periods. But still, SSD performance would be hindered for sure if it not for advances in the interface its self.