Because flash disks and other solid-state media don't employ moving parts to save and retrieve data, file fragmentation on these drives is likely to impose a smaller performance penalty than it does on rotating media. For this reason, as well as to avoid decreasing performance lifespan, Disk Defragmenter does not perform scheduled defragmentation of solid-state drives. You can still defragment a solid-state drive if you choose, but only on an ad hoc basis. To do this, run Disk Defragmenter, select the disk you want to defragment, and then click either Analyze Disk or Defragment Disk.
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