When a hard drive is dead, undetected or clicking, users need to repair it or get the lost data back. For this purpose, the very basic and first thing to do is to diagnose the hard drive and therefore, it’s quite necessary for users to learn how a hard drive works and what’s the hard drive booting sequence.

Hard Drive Booting Sequence

  1. Drive power on the PCB ROM returns status
  2. Drive self check
  3. Spindle motor spins up
  4. Heads are un-mounted from landing zone
  5. Servo reads the firmware stored in the ROM
  6. The firmware in the service area is read
  7. The firmware extensions are read
  8. If an error occurs during this process the back up copy of firmware is read. Read more