SSD Not Detected Due to Controller or Firmware Failure

This is the most likely cause when a drive remains invisible in the BIOS/UEFI across multiple computers, even after checking physical connections. To confirm this, connect the SSD to a secondary, known-working computer or use a dedicated USB-to-NVMe/SATA adapter. If the drive fails to appear in the BIOS or Disk Management of a second system despite verified cables and power, the internal controller chip has experienced a critical hardware failure or firmware corruption.