Just to provide a bit of history for future readers, disk fragmentation is *NORMAL* behavior. For normal disk drives, there is a magnetic head that has to move (seek) every time it wants to read a different bit of information. Because it's mechanical, the farther it has to move, the longer it takes and thus the slower your system is while it is trying to find the information. This is called "seek time" and is why you see something like 5-11ms seek time rating for HDDs. SSDs work like RAM in that there is no moving magnetic head -- it's all direct access by address, so it absolutely does NOT matter where on the SSD the bits are located -- it is always instant when finding the the data. So, seek time for SSDs is in the sub-ms range meaning there is effectively zero cost/time to find data in the SSD's memory chips. So, fragmentation is largely irrelevant for SSDs.
The reason defragmentation is BAD for SSDs is that each "cell" or part of the SSD's memory chips where the data is written can only be written to or read from a certain, limited number of times. So, every time something rewrites the data, you are losing a cycle from the lifetime of that cell. Because you gain nothing (see above) from rearranging the data on the SSD, this rewriting of data is simply lost hours from the lifetime of the drive.
For more info on the differences and terminology, see: http://en.wikipedia.org/wiki/Solid-s...rd_disk_drives
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