Learn how to fix a locked mac drive and get it working again. This guide will help you diagnose your hard drive’s permission issues and demonstrate what to do if your external hard drive is “read only” on your mac — not only to fix the error but also to preserve your data. Reformatting the hard drive is often the most effective solution to the “read only” permission issue on mac However, note that this process will erase all data from the drive Reformatting involves wiping the drive clean and setting up a new file system
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