So i bought a HDD caddy for my ODD and a HGST Travelstar 7K1000 and whenever i restart, it does this clicking sound Dropbox - HDD Click.mp3
The other hard drive in bay 2 never made this sound in the 9 months I had it and it's the same manufacturer and model. Again, it makes this sound ONLY when restarting, otherwise it is pretty silent.

My setup: Windows 10 Pro
Bay1: Adata SX900 SSD 128GB
Bay2: HGST Travelstar 7K1000
ODD: HGST Travelstar 7K1000