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#11
To be maybe too precise,, use the Windows disc optimization utility. It won't defrag an SSD. It'll run Trim on it, once a week. (Trim (computing) - Wikipedia) The link isn't easy reading, but it gives you the bottom line: flash based SSDs need to run Trim or writes will be slowed over time. HDs benefit from defragmentation because they aren't fully random access devices (the head has to be positioned over a disk, and then the disk has to spin around to where the data are). Data (or code) benefit from being arrange so that they can be sequentially accessed.