Vilma ® Software Hal is a powerful hex editor witch allows you to edit all file types and the content of you physical or logical drives and partitions. You can also access and edit the virtual memory of your machine running processes. It reads the drive content sector by sector and write the changes directly there on the same way. This also mean that the partitions of the other operating systems like Linux (for example) can be accessed. It is possible to make backup copies of them. A good tool to save this part of a files witch content is not in some physically damaged sector on your drive. To see the complete Hal documentation click here.