How do I Write Protect an external USB Drive

[swandy]

I have an external USB drive that is formatted for Max OX Extended (Journaled). It has a backup of my music collection so I want to write protect it so that it can only be READ and not erased or any of the files erased. How can this be accomplished - running an iMac and El Capitan.

I have tried right clicking on the drive and the sub folders in Finder and changing the Read/Write attributes to READ ONLY for myself and everyone, but I can still delete individual files.

Thanks.

 

[mikecwest]

Check this out, and see if it helps to do what you would like:

http://apple.stackexchange.com/ques...te-protect-make-read-only-a-usb-drive-in-os-x

 

[Shirasaki]

If hardware supports it, achieving read only would be very easy, like what some SD card does.

 

[Falcon16]

you'd want to check the option in the permissions so that the individual files in the folder inherit the permissions of the parent folder