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I have an external USB stick (Kingston DataTraveler 3.0). I can read the files on it (I have some movies that I can play) but I can't add anything to it or delete anything that's on it. I've tried to format it using Disk Utility but I keep getting this error:

Error: -69877: Couldn't open device

Nothing I found online seems to work. It is very annoying because the disk is obviously fine since I can access all the files. Does anyone know anything I could try? Thanks so much.

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Reset to default
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Try formatting in another computer just in case, but the chances are a write error has triggered the firmware write protect, in an attempt to safeguard your existing data.
This, to all intents & purposes, irreversible.

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  • Ah, I see, thanks. Unfortunately I don't have another computer available so I'm trying everything with the one I have at the moment.
    – Charles Ingea
    Commented Apr 6, 2020 at 11:10

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