Windows 7 uses the indexing feature to provide you fast search results..however if u have a portion on the hard drive which you search very less often..u can turn this off...windows will still search for your file but jst take a little longer...
To disable Content Indexing on a disk.
1. Click Start – Computer.
2.Right-click the disk (say c:) and select properties.
3. Uncheck “Allow Files on this drive to have contents indexed in addition to file properties“.
4.Click Apply and OK.
You will be asked a option and select "apply to c:\folders and sub folders"
later if u get any messages regarding privileges click on "continue" and then "ignore all"
reboot your system...u will see a noticeable change in the performance..
Feel free to comment.