Note: This tweak only works on Windows XP/.NET.

This setting will rearrange files on the hard drive when the computer is idle thus improving the performance of the system.
1. Open your registry by clicking on Start > Run > Type: "regedit" and find or create the key below.
2. Create a new DWORD value, or modify the existing value, called "EnableAutoLayout" and set it according to the value data below.

System Key: [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\OptimalLayout]
Value Name: EnableAutoLayout
Data Type: REG_DWORD (DWORD Value)
Value Data: (0 = disabled, 1 = enabled)

3. Exit your registry, you may need to restart or log out of Windows for the change to take effect.

Note: The computer must be restarted before the changes take effect.