First of all, stop working on the drive. Don’t save any new file, doing so would overwrite the lost data and further cause permanent data loss. As once data gets overwritten it becomes highly impossible by any Data Recovery Software or Data Recovery Services to recover overwritten data.
Use Windows Data Recovery Software to retrieve your lost data. Do not install the software on to the same drive. Install it on a healthy machine and connect this faulty drive as salve to this machine and then proceed with the recovery.
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Levin
iPod Recovery