Defragmenting SSDs

You should never defragment a solid-state hard disc (SSD). SSDs can only be written and re-written a certain number of times and defragmenting will hardly increase performance in an SSD due to the way they are designed. On the other hand defragmenting a classic hard drive really increases performance because these normal hard drives have moving read/write heads. Having data that belongs together located in the same area enhances performance significantly because moving the head to another location takes time in classic hard drives.