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I don't want to use fat32, I want use the more stable ext2.

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up vote 3 down vote accepted

You cannot use anything but FAT for the external SDCard. Android will not mount the card if it is not FAT.

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And the internal memory what uses, that depends on the ROM? –  Gabriel A. Zorrilla May 31 '11 at 15:42
    
Internal SDCard? I believe that is also FAT. as for the other areas of the internal storage, like /system and such is ext4 starting with 2.3. Prior to that it used yaffs2. –  Ryan Conrad Dec 17 '11 at 16:33
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I've managed to do it on Harmony developer board using adb shell:

adb shell "mount -t ext2 /dev/block/mmcblk3p1 /mnt/sdcard"
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