Hopefully, TestDisk will find your lost partition(s) and give you the option to write the recovered data to disk. TestDisk is a free data recovery software that is used to recover deleted or lost partition, recover data emptied from Mac Trash (or Recycle Bin on Windows), recover files from FAT, exFAT, NTFS, and ext2 files system. Here comes the second best way to get lost files back - that is to find a reliable data recovery software, like TestDisk Data Recovery. But considering the fact that very few of us have the habit of backing up files, this way is not the most suitable for us. The best way to recover lost files is to back up before they are lost. When facing that problem, we will get very anxious and be eager to recover those lost files. Posted by Juno to on August 23th, 2017 Nearly all of us have experienced losing important files, no matter our files are lost due to mistaken deletion, unintentional format or some other unknown reasons. Testdisk For Mac Tutorial For Beginners.