iVoy,
this what I have:

[folders]
data_folder_name="iGO_Basar"
linked_root_list="/extdata /sdcard2 /sdcard /sdcard/sd /sdcard/external_sd /mnt/sdcard /mnt/sd /mnt /storage /mnt/sdcard/sd /mnt/sdcard/external_sd /mnt/extsdcard /mnt/sdcard/extStorages/SdCard /ext_card /mnt/ext_card /mnt/extSdCard /mnt/ext_sd /mnt/sdcard/extStorages/SdCard /ext_card /mnt/ext_card /mnt/extSdCard /mnt/ext_sd /storage/extSdCard /mnt/storage/external_sd /storage/sdcard0"
has_secondary_root=1
android_secondary_root_path="/storage/extSdCard/addons"


What is in red is the common denominator of the three igo versions that I have in my device (NOTE 4).