You can supose that your HDD have bad sectors after some signs like the bigger time to load your OS, data losses, or the impossibility to access your data because the OS didnt load. But its pretty unsure that you have bad sectors.
One method is to use a live cd of any Linux kernel( like Ubuntu, Fedora, LinuxMint etc.) and after you boot from cd and select the try that kernel option, you must go to Accessories and then to Disk Utility.
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A HDD with some bad sectors |
Another method is to use an application like MHDD that you can use after you create an bootable cd/ dvd or usb stick and then test your HDD. Using this program you will see a lot of datas about your HDD.
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