Hope I have ever read this earlier. Days ago another one asked the similar questions. Thus he formatted twice for his hard drive and get 20% file back finally.
I list some of my opinions:
Format the hard drive again and again will affect the success rate of recovery.
You don’t know how much you can get until you try, 20% or less, who knows? Just try.
Please note:
Format recovery is really easy for some recovery tools.
Normally we will get most of the files back as the “data” has not been destroyed, with the proper tool.
Format again will destroy the data structure directly so you may not get the files back (no matter what recovery tool.)
After formatting the hard disk, please DO NOT save new files into the device, or will cause the data overwritten --- this is also the reason why we can’t recover the files back.