Click Click Click...your hard drive just went to computer heaven, with ALL of your data.
Intro to Magnetic Disks
Does a clicking internal HDD mean that the platter is scratched and the data is unrecoverable for professionals? It clicks for 10 seconds during boot-up and then stops. - Quora
Head crash - Wikipedia
Hard Drive Platter Scratch diagnostics at PITS Data Recovery LAB - YouTube
I'm totally screwed.” WD My Book Live users wake up to find their data deleted | Ars Technica
Hard Disk Drives - E-Computer Concepts
2.2 ElectroMechanical Hard Disk Drive (HDD) Overview | Mycloudwiki
Amazon.com: Seagate Archive HDD 8TB SATA 6GBps 128MB Cache SATA Hard Drive (ST8000AS0002) : Electronics
What is the HDD low level format, and when is it needed? - Quora
CS111: Lecture 10
PassMark DiskCheckup - SMART hard drive monitoring utility