

Some permissions settings prevent your Mac or your user account from writing to the disk.This can happen with disks that are formatted as NTFS. The drive is formatted in a way that means your Mac can read it but not write to it.There are two possibilities when you see a message telling you a hard drive, USB stick, or other external storage media is read-only. Fortunately, it’s not too difficult to fix the problem. You may see a message telling you that the drive is read-only. However, you may encounter errors now and again, and one of the most common is that your Mac is unable to write to the disk. Most of us use some kind of external storage device with our Mac at some time or another, whether it’s a USB stick, flash drive, external hard disk, or SSD.

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