The computer will skip on such drive, and may give you an error message. What happens if the internal process of drive initialization by its firmware failed by some reason? Then the CMOS will not be able to identify the failed hard drive. Technically, a computer-to-drive dialog is always starts with BIOS tests, and once drive is detected in motherboard's CMOS - it is accepted for the full-time job. If the microcode executes all service-commands flawlessly without any errors, and the drive's starting process passes all self-check-tests and initialization procedures, then the hard drive is ready to read and write data, and communicate in the universal digital language with other computer components, operating system, and user software. That disk-service software (or microcode program) must boot itself: instantly, error-free, right off the drive is powered up on the computer's start up. Whether the drive is connected to a computer through an external box, or just powered from a separate power supply, the first thing it does is to start booting its own internal program, a firmware that acts just like a computer OS. You might be surprised to find out of how a hard drive - as a separate device - resembles computer. How Hard Drive works: Firmware on Disk Platter and PCB
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