"With smarter file systems and faster disks and PCs, file fragmentation isn’t the performance suck it once was. Older computers had a habit of splitting files and spreading the parts all over your hard drives, but modern ones don’t do this as much. Not even close. That said, a bimonthly pass with a capable defragger can help you maintain peak performance on a heavily used hard drive.
However, solid-state drives, which use flash memory instead of a hard-drive platter to store data, are another story: My tests showed little or no benefit from running a number of disk defragmenters on a heavily used SSD.
Conventional logic dictates that you should never defrag an SSD, because the SSD controller writes data in a scattershot-fashion to multiple NAND chips and locations, using algorithms that only the controller understands. The operating system sees it as a hard drive with sectors, but the data is spread all over the drive by the controller. Defragging these “sectors” is like trying to assemble a jigsaw puzzle blindfolded: You can feel parts of the pattern, but you can’t see the whole picture. In addition, NAND is good for only a few thousand write cycles, so defragging can reduce the SSD’s lifespan by unnecessarily writing data to it."
Link to Entire Article: PCWorld: Fragging wonderful: The truth about defragging your SSD
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