Well, than I can be better than those happenings.
I have fixed the overheating problems by using Lego+Notebook Cooler[...]
It lowed the heat to 53->40C...
Still, lose all data in 400GB.(Bad sectors and hardware header corruption)
Heat doesn't usually kill HDDs, they're typically pretty resilient to it. Its totally more normal to lose the chip first in a notebook that's running too hot. But, whatever the reason, bad sectors often mean a failing disc, but maybe the heat simply caused corruption during writes (If you are lucky).
A good test is to run chkdsk a couple more times, if the exact same sectors and errors come up again, might be just corruption. If you get an increase in failed sectors each time you run it, the disc is failing; if so, never trust this disc with anything important again, even if it looks fine after a format. It'll just happen again.
Sorry about your data! How old is the laptop, and what brand is the disc?