Sony VGC-VA10G - Manual (Page 105)

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Upgrading Your VAIO Computer
Installing an Additional Hard Disk Drive
You can install up to two SATA hard disk drives to the internal hard disk drive bay.
!
If you remove the back panel immediately after you shut down the computer, the internal components may be too hot to touch. Wait about one hour to
let the components cool down before you attempt to remove the panel.
To install an additional hard disk drive
1 Shut down the computer and turn off all peripheral devices, such as a printer.
2 Unplug the computer and disconnect any peripheral devices.