Tom Nixon about

EXT4 SD Cards in CyanogenMod 11

04 Apr 2014

Using ext4 formatted SD cards in CM11 is relatively easy, but there’s a lot of information on forums that seems to be wrong, misleading, or incomplete. This method worked for me:

  1. Plug your SD card into a Linux PC.

  2. Format the card to EXT4; either use gparted, or run something like

    sudo cfdisk /dev/mmcblk0
    # create a single primary partition
    sudo mkfs.ext4 /dev/mmcblk0p1
  3. Mount the card, and make the root world-writable:

    sudo mount /dev/mmcblk0p1 /mnt/disk
    sudo chmod 777 /mnt/disk
    sudo umount /dev/mmcblk0p1
  4. Put the card back in your phone; if all is well, the folder /storage/sdcard1/Android should have been created.

Removing and formatting the card with the phone turned off worked for me, though just unmounting/mounting may work too.