I run the Recuva free version. The message I get to recover an external hard drive which became corrupt:
"Unable to determine file system type".
Should I buy the Pro version? What guarantee doe I have that it will be able to recover that drive??
Whether you buy the Pro version is up to you. It doesn't offer any greater, or better, data recovery processes nor does it solve the file type problem. There are plenty of posts on that subject if you do a search.
There is no guarantee that any data can be recovered, from any recovery software or technique.
Hi Reichert, and welcome to the forum.
Have a look here, it may help.
No magic bullet for recovery sadly, but good luck with what you try.