This tweak made a huge difference in my laptop, it works on desktops as well, but makes it more sensitive to power failure which is not a concern on your lap top as it has a battery. When you are done your computer is about 20% faster for disk operations, which also speeds up e-mail using Outlook with a PST, and anytime your computer is using the page file for additional Ram. It also speeds up the time to shutdown, and resume from hibernate.
Here’s how you do it.
Open the Device Manager in the Control Panel or you can quickly get to Device Manager by just typing device into the start menu search box. (Or from the command line, devmgmt.msc)
Open the Disk drives section of the tree, and right-click on your hard drive. Select the Policies tab, and you should see this dialog:
Enable both check boxes, and voila you are done. Enable write caching and advanced performance on hard disks increases the chance for data loss if you experience power failure, and should only be used for internal drives.