And it’s usually done at 1 am on Wednesday.
For opening the defragment window just go to the start menu and write “defrag” in the search box. Vista user use UAC prompt for this purpose.In snapshoot there is just one drive otherwise you will see all the drives here.Then you will see the dialog box, the dialog box for window 7 wills also same like this snapshot, here you have to click on Configure Schedule button.
If you want to disable automatic defrag then you just need to uncheck the box. If you want to modify the schedule according to your desire then just click on Modify schedule button.If you are using windows vista with Service Pack 1, so can chose the rate of automatically defragmented during the scheduled defrag. The users of windows 7 can chose the volume from the start window by pressing on “Select Volume” button.
Configure Disk Defragmenter Schedule in Window 7