Would data recovery be possible after Acer hidden partition reinstall?

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http://serverfault.com – Someone did a re-installation of his Operating System of the C: drive using his computer's 'Acer hidden recovery partition' (the alt+f10 procedure). Then he chose 'do not back up personal data (this will wipe the entire C: drive)' during the recovery process and his system was 're-installed'. All of his personal data was in that C: drive. Does an Acer hidden partition recovery install zero-format the disk? Serious issue: He didn't backup his data. His data is now lost, supposedly. Would it be possible at all for me to recover all of his 'my documents' data (important financial data, years (HowTos)