USB Drive Is “read-only File System” And Cannot Umount – How To Fix

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I ‘just’ noticed that at some point, my USB backup drive on my server is mounted as read-only and all of my background sync cron jobs have been failing.

So I need to fix this without rebooting the server.

I can VNC into the server and running “mount” shows:

/dev/sdc1 on /media/HD103SI type ext4 (rw,nosuid,nodev,uhelper=udisks)

and umount gets:

# umount /dev/sdc1
umount: /media/HD103SI: device is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))

How can I get this drive r/w?

2 thoughts on - USB Drive Is “read-only File System” And Cannot Umount – How To Fix

  • I ‘just’ noticed that at some point, my USB backup drive on my server

    Have you tried “mount -o remount,rw “?

    The unanswered question here is why did it go read only, and does this condition still exist?

    Barry

  • # mount -o remount,rw /media/HD103SI/
    mount: cannot remount block device /dev/sdc1 read-write, is write-protected

    The burning question of the day……

    Should I ‘just’ unplug it, power cycle it and reconnect it?