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I have to give back a USB drive given to me from work that has some personal financial data on it. I already deleted the files, but when I look at recovery programs, they're still there! I've tried to "erase free space" in Disk Utility (35-pass erase) and Disk Drill can still find them. Is there any way I can permanently delete the data so nothing shows up in recovery programs?
"Permanent Delete" and 35-pass zero-rewrite are only effective on magnetic media (spinning hard drives). On USB media you're just wearing out the solid state memory. Did you verify that you an actually recover the data you thought you deleted, or are you just seeing a reference to the file? – NReilingh – 2012-03-16T04:04:12.727