Don't disassemble the hard disk of your laptop casually, but open the cover at the bottom, unlike the front or side of the general machine, you can take out the old hard disk by unscrewing the screw. So it's best to read the instructions first, and it's the same for some hard disks to open which cover and add memory. It's a good choice to buy KINGSTONE with DDR333. Now it's around 430.

Suggestion: Find a local Sony dealer, but buy your own accessories first. Ask the dealer to help you install it, and remember to bring the invoice.

Look at the picture:

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You can see that there are many small arrows pointing to the place you want to remove, not the small cover. You'd better find a dealer to help you install this computer.