Step 1) Run Stellar Phoenix Mac Data Recovery and click the 'Start Scan' icon on the main interface of the software.
Step 2) Select the unmounted Disk Drive or Media from the left pane of the software. Click on Recover Data and choose Quick Recovery or Advance Recovery for the unmounted disk drive then click on Start Scan.
Step 3) The software scans the selected volume and lists all the recoverable files and folders in a tree view. After completion of the scanning process, you can click on any file from the tree and see the preview, using Mac Preview.
Step 4) Select the files or folders to be recovered and click on Recover button on the bottom right corner of the interface. Now provide the destination location and software will save all the recovered data at the specified location.