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Yeah… either the system controller is dead. Another thing is to check your drivers in Device Manager and try updating or install a new driver from Sandisk
In terms of solutions, have you tried using a data recovery tool like EaseUS to retrieve any lost files? It might be worth giving it a shot if you haven’t already. EaseUS is really user-friendly and effective, so it’s definitely worth a try.
As for getting the drive to mount again, have you tried using a different cable or port? Sometimes that can make a difference. If that doesn’t work, you might want to contact customer support to see if they have any suggestions or if the drive is still under warranty.
In any case, I hope you’re able to retrieve your files and get the drive working again soon!"