Bad strange noise on MacBook pro late 11

Mictzchau wrote:

Every time I start the Mac I hear this sound, I wonder if it's disk or what..?

Also happening after Mac wakes up from sleep

[Edited by Moderator]

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To my ear, that sounds like the DVD reader, if so equipped.

are you sure it does not have a disc inside?

Full or empty, it will only make noises at startup, so you can think of it as an extension of the chime sound.