Startup noise

i know this isnt failing, or anything bad but im just curious.

anytime before the drive itself spins up, theres a “bzzzzt” noise, i know it isnt the arm, or the platter motor, im just really curious as to what it is. happens often when the drive goes idle and shuts down (set todo that) and it turns on, i get a “bzzzzt” then it spins up

500GB WD my book

If the sound is what I think it is it’s totally normal. It’s the sound of the drive actually spinning up.

Without an audio clip it’s really hard to tell however…

http://www.mediafire.com/?t19de59z217t5nk

sound clip, at the beginning thats when the noise starts, followed by the actual spin-up