If you have the second one, you cannot disable Optane -- if that part of the drive is malfunctioning, the entire SSD will need to be replaced (it's not a separate cache drive, it's built into the Intel SSD).
If you have the second one, you cannot disable Optane -- if that part of the drive is malfunctioning, the entire SSD will need to be replaced (it's not a separate cache drive, it's built into the Intel SSD).