I take such to another desktop to boot Linux and see if it's gone. If it's that far gone to show zero in size and nothing in Linux then it's one for the data recovery houses as no software brings those back.
As to your personal files, I do encounter an occasional person that was never reminded to backup what they can't lose. But that is increasing with smart phone use because of the millions of smart phones today and an industry that doesn't want to spook the herd.
I shared an inside view of data recovery houses at https://www.cnet.com/forums/discussions/a-look-behind-the-scenes-on-hdd-recovery/
My PC has suddenly stopped booting. It makes two clicking sounds when powering on, says "3rd master disk error" and won't boot Windows.
I have now also noticed that the drive size of the HDD in BIOS shows 0MB, which from what I can tell is not good at all and may mean that it's completely fried and I have lost everything? I have a lot of pictures and files from over the years that aren't all backed up and I would be devastated to lose. It also now doesn't show the HDD as an option in boot priority, which it did before (after the error it was still an option, but after multiple reboots it's randomly disappeared since).
I have a bootable USB which allows me to boot from, but it doesn't recognise the HDD to run a disk check.
Does anyone have any suggestions? Really don't want to lose all of my personal files.
Any help/advice would be greatly appreciated.