To enable us to help you better, you need to provide as many details as you can about the problem you are experiencing.
Why do you think it is crashed? It is still shown in Disk Management?
If it is shown in Disk Management, as to your important data, you can simply use a data recovery tool to scan it and check whether it is recoverable, like Recuva, 4Card Recovery, PhotoRec and the likes.
But, if it cannot be shown there, you may ask some professional data recovery companies or experts for help.
Note: Save all important data on several places or locations.