Windows 7 and 8 automatically run 'defrag' on spinning hard drives through it's Optimize Drive feature. However, running 'defrag' on an SSD (drive) actually reduces the life of the drive. Fortunately, Windows provides a TRIM Command feature that is enabled when an SSD is installed in a laptop or PC.. Per the literature. TRIM actually extends the life of an SSD.
To confirm this feature is enabled on your SSD hard drive use the following:
1. Open Command Prompt with Administrative privileges (Run as administrator)
2. Enter the command "fsutil behavior query DisableDeleteNotify"
3. If the result is '0' TRIM is enabled.
Read more here Should You Defrag an SSD
