So the data is spread around to keep from hitting any one address too many times.Īs a result of all that, SSDs actually don't need as much free space as do spinners. In fact, SSDs deliberately spread data around for what is known as wear-levelling, as the memory locations can only be used for a certain (really high) limited number of times. SSDs don't have to move any heads, don't really care about contiguous space because any address is equally accessible and fragmentation is meaningless. That is why defragging a spinner can improve performance. All those head moves take time, making the response time slow. Spinners need a lot of space on them because they try to find a contiguous space to write the file, and if they cannot find that space, the heads have to move a lot more to spread the fragments of the file all around the discs. SSDs performance, compared to spinners, is really so much faster that any slowdown that might be caused by the drive having to do some data juggling is trivial. Lots of really bad information in that article.
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