There was a time when graphics accelerators were unheard-of and everyone just used onboard video. But graphics accelerators didn't have to reach price parity with onboard video to win. They just had to become the best choice for most users. (Nowadays, onboard video is making a comeback due to some excellent chipsets from Intel, but that's another story...)
To sum up: in laptops, phones, music players, and tablets, hard drives are either entirely phased out or nearly there. HDDs will be with us for a while on desktops and servers, but mostly as the new tape drive.
I wonder what kind of performance Tux3 will get on SSD. SSDs do benefit from larger contiugous writes as opposed to small, scattered writes. So to the extent Tux3 can provide that with its deferred I/O mechanism, SSDs will benefit. Of course, SSD firmwares also try to accomplish the same general goal of write coalescing. So there is a risk of burning CPU on something that firmware is already doing.
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