I bought it half a year ago. There were no problems at all.

I almost do not turn off the computer. But I had to do it for 10 hours. Everything was OK.
But when I forcibly requested C drive check
with the recovery of bad sectors and rebooted for this, then at the verification stage the process crashed by 14 percent, and after my manual reboot, the hard refused to work - there was an inscription on the screen like: "... or insert other media ....".

I booted from DVD-Live and tried to run ScanDisk from there, but the computer crashed and after 2 minutes of pause I received a message that a RAW format disk was detected and that the program could not check it.

Reinstalled Windows 7 Ultimate 64 OS on a new hard, and tried to connect the broken Seagate-500 Gb to it. he appeared in the device manager, but the system immediately asked for his formatting - I refused, and then he disappeared from the device manager forever.

And if I physically disconnected it and reconnected (see above), the same story was repeated.

What am I supposed to do now?

try using hddsuperclone (it is on this forum)