1. # tune2fs -O extents,uninit_bg,dir_index /dev/dev-name
    For example convert /dev/sdb1 to ext4
    # cd /; umount /dev/sdb1
    # tune2fs -O extents,uninit_bg,dir_index /dev/sdb1

    Next run fsck, enter:
    # e2fsck -pf /dev/sdb1
  2. #mount -t ext4 /dev/sdb1 /path
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