Kirk Stockham, a retired computer forensics investigator, will show members of the Modesto PC Users Group how to find hidden data on a hard drive. He will also explain how to recover data that may have been accidentally erased and talk about identity theft. The presentation will be at 7:30 p.m. Jan. 27 at Destiny Christian Center, 1161 Carver Road. At 6:30 p.m., the club will host a question and answer period. The public is welcome.