Timeline for Unable to write to any external USB, even after formatting it
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
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| Aug 20, 2020 at 4:17 | comment | added | Joy Jin |
Have you tried the mount -uw command? Does it work?
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| Aug 20, 2020 at 4:16 | comment | added | Joy Jin |
Perhaps post the output of diskutil activity while you execute the commands.
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| Aug 20, 2020 at 4:15 | comment | added | Joy Jin |
You should get this error instead if your device is read-only: mount_exfat -o noowners,rw /dev/disk2s1 /volumes/2 mount_exfat: /dev/disk2s1 on /volumes/2: Permission denied
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| Aug 20, 2020 at 4:11 | history | edited | Joy Jin | CC BY-SA 4.0 |
added example error output due to read-only disk
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| Aug 20, 2020 at 4:01 | comment | added | Joy Jin | This is very unusual. Try starting in recovery mode and see if the disk is read-only. | |
| Aug 19, 2020 at 14:54 | comment | added | abhchand |
When I look at /Volumes/NONAME I see that it's owner and group are both _unknown, which I've never seen before
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| Aug 19, 2020 at 14:52 | comment | added | abhchand |
Thanks, the volume is indeed read-only. First I tried mounting as write-able but I get the error mount_exfat: /dev/disk2s1 on /Volumes/NONAME: Operation not permitted. Then I tried sudo -i and I still could not touch a file on the disk: touch: /Volumes/NONAME/1: Read-only file system. I'm very surprised a root user can't write to the disk. I don't see an etc/fstab file on my system - any idea what could be corrupted?
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| Aug 19, 2020 at 10:20 | history | answered | Joy Jin | CC BY-SA 4.0 |