Windows Event Log is showing tens of thousands errors (EventID 521) describing a 'AHCIPortErrorRecovery' on Port Number 0, Bus 0, Target 0, Lun 0
Bus 0, Target 0, Lun 0 may refer to a Windows SSD (drive C) linked to SATA port 1 (1st Controller, port 1-6, Gray)
but
Bus 0, Target 0, Lun 0 may also refer to CD-ROM , linked to SATA-port 7 (1st item connected to the 2nd SATA controller, port 7-10, black)

I can't figure out details about the Port Number though.

Haven't found a tool that reports the port numbers.

Thanks.