Operating System is win8.1 with hard disk 1TB.Want to defrag.But I've made several partitions so will I have to defrag each partition or just the main drive that is C: where windows is installed.Because when I open defragment tool that is "Optimize Drives" after navigating to X:>Properties>Tools>Optimize.All of the partitions including hidden that is "Recovery" partition and "System Reserved" partition with C: and other partitions O: ,E: and G:.Which means I have three partitions with one main that is C: where windows,itself is stored.