Error 20 occurred at disk power-on lifetime: 11269 hours (469 days + 13 hours)
  When the command that caused the error occurred, the device was active or idle.

  After command completion occurred, registers were:
  ER ST SC SN CL CH DH
  -- -- -- -- -- -- --
  40 51 00 19 05 3c e1  Error: UNC at LBA = 0x013c0519 = 20710681

  Commands leading to the command that caused the error were:
  CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name
  -- -- -- -- -- -- -- --  ----------------  --------------------
  c8 00 08 19 05 3c e1 08  19d+03:19:10.936  READ DMA
  ec 00 00 00 00 00 a0 08  19d+03:19:10.936  IDENTIFY DEVICE
  ef 03 45 00 00 00 a0 08  19d+03:19:10.936  SET FEATURES [Set transfer mode]
  ec 00 00 00 00 00 a0 08  19d+03:19:10.936  IDENTIFY DEVICE
  c8 00 08 19 05 3c e1 08  19d+03:19:10.636  READ DMA