Sony VGC-RM1 - Manual (Page 108)

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Upgrading Your VAIO Computer
Installing an Additional Hard Disk Drive
You can install up to four SATA hard disk drives to the internal hard disk drive bay.
To install an additional hard disk drive
1 Remove the front panel of the main unit.
See Removing and Replacing the Main Unit Front Panel
(page 89) for the detailed instructions.
2 Push the button (1) to release the hard disk drive holder lever (2).