There are two types of bad sectors — one resulting from physical damage that can't be repaired, and one resulting from software errors that can be fixed. (howtogeek.com)
Your PC may occasionally freeze, you may hear unusual sounds from the drive, you may experience data corruption, or your computer may detect bad sectors on the drive. (howtogeek.com)
However, if your hard drive is rapidly developing bad sectors, it may be a sign that your hard drive is failing. (howtogeek.com)