After updating my system from an eight-year-old motherboard and processor to a new mobo and cpu, the two oldest drives from my old system are no longer seen by either Device Manager or Disk Management. The drives, both about 7 years old, are a Samsung HD 753LJ and a Maxtor STM 3500630AS. They are both SATA drives and are attached to two of the six SATA ports on the new mobo. I suspect that they need firmware updates to enable them to work on the new mobo, a Gigabyte Z170X-Gaming 7, which also does not see them in the BIOS. However, I no longer have the old system, so I don't know how to update them if I can't mount them. I'm not an expert in this, so any help would be welcomed.