This error has occured recently, with the warning message that the SSD is reformatting. It does not appear as a drive in File Control, only the CPU is visible. The running program writes to table files in this drive (or would, if working). As I cannot see the drive I am unable to try manually reformatting it. The OS version is up to date. Not sure if related, but a number of watchdog errors have been counted while running the program.