TestDisk is a powerful free data recovery software! It was primarily designed to help recover lost partitions and make non-booting disks bootable again when these symptoms are caused by faulty software, certain types of viruses or human error (such as accidentally deleting a Partition Table). Partition table recovery using TestDisk is really easy.
Does TestDisk change/convert RAW to NTFS/FAT32 without data loss?
The answer is YES, but it is hard to do RAW partition recovery using TestDisk. When the boot sector of the NTFS/FAT32 partition has been damaged, TestDisk can repair damaged volume and then convert RAW to NTFS/FAT32. However, TestDisk is a command line utiliy and doesn't provide user interface. If you don't have technical knowledge, it will a time-consuming job to convert RAW to NTFS/FAT32 using TestDisk. But there is a TestDisk alternative tool: M3 RAW Drive Recovery.
Compared with TestDisk, M3 RAW Drive Recovery provides easy-to-use UI makes operations very simple, don't require technical knowledge, it just needs 3 steps to convert RAW to NTFS/FAT32 file system.