In the rare cases when repairing the file system will not work, you might be able to recover some or most of your data from this partition image using advanced forensics tools. This recovery process is very technical and you might need help from someone experienced with data recovery.
Plug in the hard disk on which you want to save the partition image of your Persistent Storage. You need as much free space as the size of your Persistent Storage, usually 8 GB less than your TailsUSB stick.
Right-click (on Mac, click with two fingers) on the new volume that appeared in the sidebar of the *Files* browser and choose *Properties* in the shortcut menu.