Select the frequency at which you want the Disk Defragmenter task to run (Every Day, Weekdays, or Every days, where is the number of days between scheduled runs). This should be a time when your computer is turned on but not under heavy use (i.e.
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HOW TO RUN DISK DEFRAGMENTER WINDOWS 8 FREE
If a volume has less than 15% free space, Defrag only partially defragments it. Defrag uses this space as a sorting area for file fragments. Note: The volume must have at least 15% free space for Defrag to completely and adequately defragment it. This means you can use the XP/2003 scheduler to automate the defragmenting of your partitions.
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HOW TO RUN DISK DEFRAGMENTER WINDOWS 8 FULL
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Your best bet would be to run a benchmark before and after running your defrag to get numbers for your particular circumstance on your particular hardware. You're going to have other factors that can't possibly be generalized.most servers you would have to factor in your RAID controller, caching, load, type of RAID, etc. Unless you have a lot of tiny files being written/erased/written to the drive, basic defragmentation should be more than enough on Windows.