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I am experiencing some issues with mounting and transfering files to a microSD card. It started with the storage device being recognized by Nautilus; however, it was recognized as Read-Only. ...
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  1. #1
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    USB Issues In 12.04


    I am experiencing some issues with mounting and transfering files to a microSD card. It started with the storage device being recognized by Nautilus; however, it was recognized as Read-Only. The lock on the adapter was not engaged. I tried reformatting the card on my machine, and it would not format. I received that the device was Read-Only. I tried another adapter with the same results. I checked the condition of the card on a Windows 7 machine, and was able to format it to VFAT. Remounted it on my Linux system, and got the Read-Only message. Even using terminal didn't work.

    I attempted to work on it some more tonight after a week of research. I inserted the card into the USB port with the adapters, and it's not even being recognized as anything mounted. I tried it using my cell phone to the same result. I added a mount point to /etc/fstab that did not help. When trying to mount the device manually I get an error message. Can someone please help?

    The mount point as added in /fstab:

    /dev/sdb1 /media/usb auto defaults 0 0

    The terminal message:

    sudo mount /dev/sdb1 /media/usb
    mount: special device /dev/sdb1 does not exist

    The output from df command:

    Filesystem 1K-blocks Used Available Use% Mounted on
    /dev/sda1 154111348 8880872 137514228 7% /
    udev 957972 4 957968 1% /dev
    tmpfs 386140 812 385328 1% /run
    none 5120 0 5120 0% /run/lock
    none 965344 156 965188 1% /run/shm

    And finally, from dmesg | tail:

    [ 5215.958520] sd 11:0:0:0: [sdb] Sense Key : Medium Error [current]
    [ 5215.958529] sd 11:0:0:0: [sdb] Add. Sense: Data phase CRC error detected
    [ 5215.958541] sd 11:0:0:0: [sdb] CDB: Read(10): 28 00 00 00 00 00 00 00 08 00
    [ 5215.958558] end_request: I/O error, dev sdb, sector 0
    [ 5216.002774] sd 11:0:0:0: [sdb] Unhandled sense code
    [ 5216.002784] sd 11:0:0:0: [sdb] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
    [ 5216.002793] sd 11:0:0:0: [sdb] Sense Key : Medium Error [current]
    [ 5216.002803] sd 11:0:0:0: [sdb] Add. Sense: Data phase CRC error detected
    [ 5216.002816] sd 11:0:0:0: [sdb] CDB: Read(10): 28 00 00 00 00 00 00 00 08 00
    [ 5216.002836] end_request: I/O error, dev sdb, sector 0

    I apologize for the lengthy list of output from my testing, but I feel it may help lead me to the answer I need.

  2. #2
    Linux Newbie hagfish52's Avatar
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    Not sure this will help, but try this:

    Right-click on the SD card in Nautilus and then click on Properties. Then click on the Permissions tab. Then change the settings under Access Control so that the SD card is "Read and Write". And click OK.

  3. #3
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    Ok, I do not know how it happened, but now everything is working fine now. I purchased a new micro card, and it was recognized and was able to be formated. I did learn that the card needs to be encrypted or my cell phone will reformat it as Read-Only.

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