If you are also experiencing data loss during file transferring, you can keep on reading this article.
After you lost files, search them immediately on both your device and computer. If you lost files because of failed "Paste", try another "Paste". If you paste the files successfully, you get them back.
If the files are lost indeed, you need a data recovery application to assist you to retrieve the lost data. Data Recovery, a professional yet easy program, is capable of retrieving lost files that have been erased by different causes: transferring failing, formatting hard drive or other devices, or simple deletion. It enables you to recover various files including photos, videos, audios, and documents in numerous formats. If you are using Mac OS X, there is also a Mac version - Data Recovery for Mac for you.
Connect your device to the computer via USB cable, and it will be automatically detected by this software. Launch this software and enter to the main interface. Select the types of files you are to restore and choose your device on the drive list to scan lost files. Then click "Scan" to recover lost files.
This program will take you several minutes to complete the scan. Preview photos and audios to check if they are your need. Select the files you want to recover and click "Recover".
Specify a location to save the recovered files. You are suggested saving them neither on the partition to which you failed to transfer nor on your device.
If you lost data during transfer data from your Mac to your portable device, or reverse, go to try Mac Data Recovery. Go for the tutorial of how to recover lost data during data transfer on Mac.