Does your disk need defragment or not?

Obviously, Vista has a powerful tool on the disk defragment and cleanup. Let's us how to make it work.

1. cmd -> type in the command "defrag (drive_letter) (param)". For example, defrag d: -a. Notice the half-angle colon and the empty space after the drive letter.

In this way, Vista will help to analysis the service condition of your disk. After around 30 sec or 1 min, it will cue you if the disc need to defragement or not.

2. If defragment is needed, then it need the command "defrag d: -v". Be careful not to reboot the computer or let its power supply drop because in the processing of defragment the disc would be read and write much more frequently than usual.