> Reallocated sector count is 880. The temperature stays above 50°C. Is this a hard drive failure? 880 reallocated sectors is a sufficient reason to replace the dying disk. For a rotating hard drive 50°C is already dangerously near the maximum allowed temperature. That temperature is increasing wear. What is your ambient temperature? You should provide cooling for your drive to make your disk approach a hopefully much lower ambient temperature instead of heading towards the maximum allowed temperature. If a possible successor of your drive is being put in that thermal environment, he won't live long. > Try to format the disk using a slow (not quick) format, which will rewrite all the sectors. Check the Any variation of a window format command will delete stuff on the drive. This is a irresponsible hint! > Is the Reallocated Sector Count high? It is sufficiently high to justify replacement. Read this SMART report to see how high those figures can get. https://forum.cgsecurity.org/phpBB3/viewtopic.php?t=12261 > There's no SMART warning. The drive is less than 3 years old. Don't expect any. If it happens to you again, check the SMART parameters regularly and you can watch the process of increasing figures.