Linux said that my hard disk is failing. Then I tried to use chkdsk/r on windows. Then wipe it out using boot and nuke(dban). My laptop was running slowly back then. After 2 weeks of not using my laptop. I decided to use the built in startup checker in the bios. It checks for the memory and the hard disk. After maybe 1 hour. The startup checker said that the startup check passed. Then I tried booting up the laptop which I installed linux mint. Then suddenly it became fast again. Note that my laptop was running very slow when I used it 2 weeks ago. Could it be that the built in startup checker fixed something? Should I believe what Linux is saying?Do I really need to replace the hard disk? The screenshot below is taken after the startup check.