Mac notebooks: Apple Hardware Test may report "HDD" alert
When you test your Mac notebook using an SSD or Flash storage drive with Apple Hardware Test (AHT) diagnostics, you may see alert "4HDD/11/40000000:SATA" if the test is looped multiple times.
The alert is erroneous and generally takes multiple loops of Apple Hardware Test to induce.
Before starting Apple Hardware Test, looping can be enabled or disabled by pressing the L key on the keyboard. If the message appears in addition to other issues with the computer that are related to the solid state drive (SSD) or Flash storage drive, schedule an appointment at an Apple Retail Store or contact an Apple Service Provider.