I partitioned my WD passport essential to use on my Mac, and I seem to have cleared all data from it including the installation guides?
How do i restore the external to its original state so that i can back up my files?
You may try WD passport data recovery solution, see this one that helped me before: WD hard drive file recovery
You may also download this data recovery tool
. You'd better stop using the WD hard drive, connect it to a windows computer and recover lost files.