Sony VAIO VPCZ2 - Manual (Page 170)

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Troubleshooting >
Recovery / Recovery Media
6 Follow the on-screen instructions until the Select recovery type window appears.
7 Select Custom recovery - Remove recovery contents.
8 Follow the on-screen instructions.
!
The above procedure involves system recovery. The applications and data you added on the storage device before removing the data for system
recovery will all be lost.
Once you have removed the data for system recovery, you need the Recovery Media for later system recovery.