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Alkthree
Asked: 2012-08-15 06:12:12 +0800 CST

How do I remount a filesystem as read/write?

  • 772

I'm trying to mount an hfsplus filesystem in a Xubuntu 12.04 VM (kernel version 3.2.0-23-generic) but when I type mount -o remount,rw /dev/sdb3 in command line it returns not mounted or bad option. Any help would be appreciated.

mount

6 Answers

  1. Best Answer

    The correct syntax is:

    sudo mount -o remount,rw /partition/identifier /mount/point

    Where mount/point is /partition/identifier's corresponding mountpoint, as listed by the following command:

    mount -v | grep "^/" | awk '{print "\nPartition identifier: " $1  "\n Mountpoint: "  $3}'

    For example, say that the above command gives this:

    Partition identifier: /dev/sda1
 Mountpoint: /    

Partition identifier: /dev/sda2
 Mountpoint: /boot

Partition identifier: /dev/sda3
 Mountpoint: /test

    The following would be the correct syntax. (We start by unmounting it, if it's already mounted.)

    sudo umount /test
sudo umount /dev/sdb3
sudo mount -t hfsplus -o rw,remount -force /dev/sdb3 /media/untitled
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  2. for busybox/android users:

    Oddly, I needed to add a space (in contrast to normal usage) between 'remount' and 'rw':

    mount -o remount, rw /

    otherwise it wouldn't work.

    UPDATE: it seems that this is almost never the case (see comments). Not sure which busybox-version + android-version I was running. I'll just leave this here in case anyone still runs into it.

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  3. Running dmesg | grep hfs showed that the filesystem was unmounted incorrectly, which I was able to repair using 

    fsck.hfsplus /dev/sdb3/
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  4. First, let us fix NTFS problems (if you have an Ubuntu/Windows dual boot setup)

    sudo ntfsfix /dev/sda7

    Before mounting we need a Directory (folder)

    mkdir ~/Desktop/disk

    Now mount the partition

    sudo mount /dev/sda7 ~Desktop/disk

    In this case "sda7" is the partition name. Now you read from and write to the partition.

    • 3

  5. I have Dragonboard 410c I connecting via adb I wanted to mount the physical sdcard as RW. the following worked for me.

    adb root
adb shell
su
mount -o remount,rw /storage/sdcard1   /storage/sdcard1

    So I can now access it in rw mode as /storage/sdcard1

    nb. /storage/sdcard0 is emulated and is /sdcard

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  6. First I typed mount to see the results and determine the mapping I wanted altered to full access was /media/linux/OLD_PC.

    This worked fine to unlock the files and folders within my old Windows system partition.

    sudo mount -o remount,rw /media/linux/OLD_PC  /media/linux/OLD_PC
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