Sony VGN-FS600 Series User Manual page 148

To change or add a memory module to the memory module underneath the keyboard
1 Shut down your computer and disconnect all peripheral devices.
2 Unplug the computer and remove the battery pack.
3 Wait until the computer cools down.
4 Unscrew the two screws next to the memory slot.
5 Turn over the computer upside down and open the LCD screen lid.
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Upgrading Your VAIO Computer