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Thread: Can't format USB as ext3/ext4

  1. #1
    Join Date
    Dec 2010
    Beans
    6

    Can't format USB as ext3/ext4

    Hi Guys,

    I have a 32Gb USB drive it came formatted as fat32 and I tried to use the right-click->format option to set it to ext4. It appears to finish but when I try to double click it I get an error saying it cannot mount the system.

    I reformatted back to fat32 and it worked, I could create files without problems.

    Then I tried ext2 which also worked.

    Then I installed gparted and tried ext3 which had the same problem as ext4.

    The fdisk -l is as follows:


    Disk /dev/sdb: 32.2 GB, 32233226240 bytes
    255 heads, 63 sectors/track, 3918 cylinders
    Units = cylinders of 16065 * 512 = 8225280 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk identifier: 0x00005429

    Device Boot Start End Blocks Id System
    /dev/sdb1 * 1 3919 31476736 83 Linux

    I also tried mounting as root but that didn't help either.

    Any ideas?

  2. #2
    Join Date
    Dec 2010
    Beans
    6

    Re: Can't format USB as ext3/ext4

    I fixed the issue by running this command:

    e2fsck -b 32768 -B 4096 /dev/sdb1 -y

    I believe it used a backup inode to rebuild the main inode

  3. #3
    Join Date
    Dec 2010
    Beans
    6

    Re: Can't format USB as ext3/ext4

    Oh no!

    It has turned it into an ext2 partition!

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