Sony PCV-W20 - Manual (Page 46)

System recovery options
Default system drive recovery (recommended)
All data on drive C is deleted. The factory default settings and software applications are restored on this drive only.
Change partition size and recover
All partitions, custom installations, and changes are removed from the hard disk drive. You can set the partition sizes for
both the drive C and drive D. The original, preinstalled operating system and software applications are restored.
Factory default settings recovery
All data and partitions are removed from the hard disk drive. All original factory settings, operating system, and preinstalled
software is restored.
The System Recovery utility does not back up your system's data. If you wish to retain your system data,
perform a back up to an external media.
Page 46