A:Answer Hello, we are sorry for the inconvenience caused by your SanDisk Extreme Portable 2TB SSD. This issue may be related to file system corruption, possibly caused by unsafe ejection, power interruption or formatting issue. We recommend formatting the drive after backing up your existing data using another device as formatting storage is a data destruction process.
Also, make sure that the USB cable is working properly, to do this, you can use another USB cable. If issues persist, we suggest contacting us by opening a support ticket at (https://support-en.sandisk.com/app/askweb)