My disk defrag window almost always shows 0% fragmentation on a machine that is rarely left running overnight during the scheduled run. If you click the analyze button it will take a while, but give you an up to the minute update, which is primarily useful after attaching a removable drive you are concerned about. Defragmentation occurs if a drive is highly fragmented which slows down the read and write process on drives because of additional metadata that needs to be processed.
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The % of fragmentation is shown for each disk/volume as well as the last time a scheduled run was executed. SSDs are defragmented every 28 days on Windows 8 and newer if Volume Snapshots are enabled (the feature is used by System Restore and thus enabled by default) on the system. You can defrag removable disks manually, or just leave them attached to the computer and add them to your schedule to run overnight.You can check the status of your disks' fragmentation by typing "disk defragmenter" into the start menu search box and clicking on the choice to open the disk defragmenter window. Unless you have changed that, and assuming you are letting your machine run while it is not actively engaged in high demand tasks or during the scheduled defrag time, it is pretty unlikely you will gain anything by defragging internal hard disks manually. Windows 7 is set to defrag during idle periods in the background by default, and is also (as a separate operation) scheduled to run as a higher priority operation at a set time. One of the fastest defraggers in the world, Disk Defrag often takes less than 10 minutes to defragment an average-size hard drive.