 How to recover lost data from a removable hard disk, a USB pen drive or a memory card with a Linux file system If you are facing a problem of data loss from Linux volumes with EXT4, 3 or 2 file system, try Hetman Partition Recovery. And to recover lost data from a removable disk, you will need a computer running Windows. Launch the utility and select your disk – USB drive or memory card that you want to restore data from. Use the necessary analysis tab in the window that opens. When it's over, the program will display the files and folders it has found in the right side of the window.