Hi all I recently bought an iMac 5K with a 3TB Fusion Drive, a beast of a machine I'm very happy with. But coming from an SSD MacBook Pro I'm not very used to an HDD, known for being more noisy. But what I noticed the other day, is that when I boot my Mac or wake it from sleep I can hear an almost electrical noise/buzzing coming from the HDD. After around 5 minutes it fully dissapears and never comes back unless I put the HDD to sleep and let it spin back up. Is this normal? I've read that during spin-up an HDD uses more power, so is that what I'm hearing? The fact that there is being transferred more power to the HDD? And if so, is this normal or should I be worried? Thanks in advance!