SSD harddrives 18 Seconds Opens 53 Programs

[gitcho]

Traditional HD's get the best performance when the data is stored in sequential chunks on the platter (ie. the head doesn't have to move all over the platter to read a block of data), but as data is written to the disk, it is not always stored in continuous chunks (may not be free sectors on that part of the platter). Defragging rearranges the data in sequential chunks.

The file structure on SSD's are mapped to relatively random locations due to wear leveling techniques used by the manufacturers to increase the lifespan of the SSD. If you defrag, you'll be doing a whole bunch of reading and writing to move stuff from one random order to another random order, causing wear to the flash in the process.