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There's a large variation in the number of sounds you can get, actually. Different BIOSes and setups all change how it sounds.

For example, the system I grew up with had two drives, a 3.5" and 5.25". The system had to density check both, but they had different speed motors, so they made different tones. It density checked A, then B, then tried to boot off A: This gave it a distinctive two-descending-tones-then-click boot sound.