G'day Christopher, welcome to the forum.

You can't see the internal drive in Windows Disk Management because it's not a MSM device as i explained to the OP in Post #2. It will only show up in Device Manager so conventional re-formatting isn't possible sorry.

If your 696 has a software problem then re-installing the firmware (system software) should have fixed it. If it indeed does have a hardware failure it's more likely a specific component failure than a dry or cracked joint, and unfortunately it's often the flash chip at fault.