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How do I do this?
I have never seen instructions but it must be relatively simple with a desktop Vaio.
1. Download the User Guide from here: -
ftp://ftp.vaio-link.com/pub/Manuals/Desktops/RZ1/RZ1_H_UK.pdf
2. Go to the section "Upgrading Your Vaio" which will show you how to open your computer's case and look at Page 100
3. There is not a section on the hard drive but look at the memory upgrade picture and you should see the hard drive.
4. The hard drive will be at the front - just under the floppy disc drive and I'm sure you can work out how to remove it and replace it.