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I'm using Mac OS 10.12.6 Sierra. Recently I've found that whenever I (rarely) reach for a usb stick to transfer images or files, they mount readonly for me. I can't seem to figure out how to mount them read-write, or what causes this.

Also the main solution I found has been to reboot the macbook pro 15 and then it'll use usb sticks normally as read-write.

It seems something to do with waking from deep sleep… but I'd like to find a way to kick it into "normal operation" without rebooting. OR to prevent it from abnormal behavior to begin with.

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  • Had same problem now (Catalina). I was using micro SD card in adapter. Unmounting, physically removing from slot and reinserting fixed the problem.
    – A.D.
    Commented Feb 12, 2022 at 17:45

1 Answer 1

Reset to default
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I read an apple forum about this, A user in the forum said that if you format the pen drive to FAT32 in Disk utility you might solve your problem. Make sure you have a backup of all the contents in the pendrive because erasing it will remove all files.

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    I also read that; it is already formatted to FAT32, and it worked daily and seamlessly on the same mac with OS X 10.11. That thread didn't have the same experience where rebooting solves the read-only problem and returns operation to read-write without any device modification.
    – dlamblin
    Commented Oct 31, 2017 at 2:01

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