WD elements 10tb makes a repeated clicking noise like a heartbeat but strong every 5 seconds while it's idle and working - External Drives for PC - WD Community
SanDisk+X600+M.2+2280+256gb+Solid+State+Drive+Sd9sn8w-256g-1102 for sale online | eBay
SanDisk SD9SN8W-256G-1002 - 256GB M.2 2280 SATA III NGFF Solid State SSD