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Thread: micro sd card cannot be formatted in ext3, but fat32 is OK

  1. #1
    Join Date
    Feb 2010

    micro sd card cannot be formatted in ext3, but fat32 is OK


    I am trying to create two partitions on my 8G scandisk microsd card - one is a FAT32 and the other one is ext3, using ubuntu oneric. I need this for it to act as a boot disk for my Beagle Board. I have checked lots of posts and am basically following the instructions at:
    But no matter what I do, the creation of ext3 file system always fails.
    sudo mkfs.ext3 does not seem to work properly. I am never able to mount
    the ext3 partition, I always get an error saying "unable to mount could be a bad bock
    or superblock or bad file system ... etc"

    So then I tried using Gparted to format the whole drive as FAT32. that works.
    But if I try to format the whole drive as ext3, gparted reports an error at
    the file system creation stage.
    create new ext3 file system 00:00:05 ( ERROR ) mkfs.ext3 -L "" /dev/mmcblk0p1 Filesystem label=
    OS type: Linux
    Block size=4096 (log=2)
    Fragment size=4096 (log=2)
    Stride=0 blocks, Stripe width=0 blocks
    32768 inodes, 131072 blocks
    6553 blocks (5.00%) reserved for the super user
    First data block=0
    Maximum filesystem blocks=134217728
    4 block groups
    32768 blocks per group, 32768 fragments per group
    8192 inodes per group
    Superblock backups stored on blocks:
    32768, 98304

    Writing inode tables: done
    Creating journal (4096 blocks): done
    Writing superblocks and filesystem accounting information: done

    This filesystem will be automatically checked every 27 mounts or
    180 days, whichever comes first. Use tune2fs -c or -i to override.
    mke2fs 1.41.14 (22-Dec-2010)

    Warning, had trouble writing out superblocks.
    I then tried various size ext3 partitions using Gparted, it does not work either.
    But FAT32 is perfect..

    Any ideas what could be wrong??

  2. #2
    Join Date
    Feb 2005
    Melbourne, Australia
    Ubuntu 12.04 Precise Pangolin

    Re: micro sd card cannot be formatted in ext3, but fat32 is OK

    Quote Originally Posted by Sredni Vasthar View Post
    Any ideas what could be wrong??
    Use gparted to write a new Partition Table and try again.
    Regards, David.
    Please use the Forum search and Wiki search for immediate help
    Please mark your thread as Solved when appropriate
    New to technical forums?: How To Ask Questions The Smart Way

  3. #3
    Join Date
    Feb 2010

    Re: micro sd card cannot be formatted in ext3, but fat32 is OK

    Hi Dave, Thanks a lot for your reply, I just saw it now. Well I tried Creating a new msdos and gpt partition table using gparted, and I tried formatting the entire SD card in ext3; but even that is not possible. Gparted always fails when creating the file system.. Is it possible that the SD card does not support ext3, but FAT is ok? Meanwhile i bought another sd card (not scandisk) for the beagle, and that works fine.. Govind


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