Home Forums Apple Help How to make USB flash drive read only Mac Tech Helproom | Windows Help | Apple Help | Digital Home & Smartphones Help | Consumer Rights Advice | Games | Speakers Corner | Beta Testing We regret to inform you that the PC Advisor Forums are now closed, and you are unable to post new comments or conversations. If you have a question about the forums, please contact us. How to make USB flash drive read only Mac Anon-2439845 18:11 17 Sep 2018 Locked Hi everyone, Really quick question. I have a new USB Flash drive, I need to put some files on it and make the USB read only so files cannot be deleted? How do I do this with a Mac?