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Thread: USB devices auto-mount as read-only...sort of

  1. #1
    Join Date
    Feb 2009
    Beans
    14

    USB devices auto-mount as read-only...sort of

    My 10.04 64-bit desktop has been auto-mounting USB devices (flash drives and my mp3 player) as read-only for some reason. I had this issue happen once a while in the past, so I simply re-mounted it as rw.

    However, even manually mounting these devices as rw does not solve the problem. I ran a few commands ahead of time to give you an idea of what we're looking at:

    Code:
    mike@mike-desktop:~$ mount | grep -i 36CB
    /dev/sdc1 on /media/36CB-D1A8 type vfat (rw,nosuid,nodev,uhelper=udisks,uid=1000,gid=1000,shortname=mixed,dmask=0077,utf8=1,flush)
    mike@mike-desktop:~$ touch /media/36CB-D1A8/wut.txt
    touch: cannot touch `/media/36CB-D1A8/wut.txt': Read-only file system
    mike@mike-desktop:~$ ls -l /media/36CB-D1A8/
    total 4
    drwx------ 3 mike mike 4096 2010-09-18 16:33 home
    mike@mike-desktop:~$ chmod 775 /media/36CB-D1A8/*
    chmod: changing permissions of `/media/36CB-D1A8/home': Read-only file system
    mike@mike-desktop:~$ sudo chmod 775 /media/36CB-D1A8/
    [sudo] password for mike: 
    chmod: changing permissions of `/media/36CB-D1A8/': Read-only file system
    mike@mike-desktop:~$
    The device currently in question is definitely already mounted rw, but the system returns a Read-only flag. I tried searching the net for the answer to this to no avail.

    Help would be greatly appreciated!

  2. #2
    Join Date
    Jan 2010
    Location
    opposing reality (VIC AU)
    Beans
    Hidden!
    Distro
    Ubuntu 11.04 Natty Narwhal

    Re: USB devices auto-mount as read-only...sort of

    Does that USB stick/device have a read only switch/tab? I feel a bit silly asking but crazier stuff has happened - just smile and slap your forehead if you find one and it's in the RO position right now!

    I have been running both 32 and 64 bit installs since 9.04 and this headache is not one of mine - none of my USB sticks (about 8 ) has mounted anything other than RW, completely usable.

    I read/heard that some of those USB sticks/devices have a software function to be RO and it takes software from the manufacturer to 'flick that switch'.
    Last edited by robsoles; September 20th, 2010 at 12:03 PM.
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    A little nonsense now and then...
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    I don't play Duke Nukem Forever so much, anymore. I am robsoles everywhere I go.

  3. #3
    Join Date
    Feb 2010
    Beans
    99
    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: USB devices auto-mount as read-only...sort of

    try this:

    sudo chown yourusername:yourusername /media/label-of-your-device

    then:

    sudo chmod 755 -R /dev/sdX where X is your device. You my also need to add the partition number, i.e. /dev/sdX1 etc.

    Try that, see how it goes.

  4. #4
    Join Date
    Feb 2009
    Beans
    14

    Re: USB devices auto-mount as read-only...sort of

    So, as I was typing out a reply to your suggestions (none of them worked, unfortunately), I figured it out


    I switched over to tty1 and was getting tons of usb errors. I tried plugging the drive into another port and it is working!

    I guess I'll have to double check the usb headers from when I connected them to my mainboard upon installation.

    Thanks for the suggestions guys

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