How can I write protect a USB

I have an external USB formatted drive for Max OX extended (journaled). He has a backup of my music collection so I want to write protect it so that it can be READ and not deleted or all files deletion. How this is possible - running an iMac and El Capitan.

I've tried right-clicking on the drive and the subfolders in the Finder and by changing the attributes of read/write READ ONLY for me and all the world, but I can always delete individual files.

Thank you.

You must disable the attribute "Ignore permissions" on the external hard drive. Just do a Get Info (command I) command on the volume desired in a Finder window and then downstairs there is a checkbox Check titled "Ignore permissions on this volume" - uncheck the box so that the ownership rules are now used for its content, then the privileges you set for those who can read and write should be respected.

Note that this applies only to external volumes that I think - the internal disk volumes does not have this checkbox "Ignore permissions" is checked.

Good luck...

Tags: Mac OS & System Software

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