vista sp1 under the number defragment the frequency is appropriate?

My system is a genuine vista sp1, does the Disk Defragmenter to run the system, the speed of a clear role to improve it? Finishing a relatively good time? Finishing each finishing c is the only disk or partition is finishing all?

there, but with the number of fragments, more than the number of words, of course, there are obviously feeling, but too many do not collate, his first analysis, If there is a need to organize, all the analysis of the disk are not a frequent sorting debris on the hard disk has hurt, finishing the debris is not necessary, it is considered necessary on the whole.