What command-prompt command do you use to determine if a hard drive has bad sectors?

To check for bad sectors on a hard drive using the command prompt, you can use the chkdsk command followed by the drive letter and options. For example, type chkdsk C: /f /r, where C: is the drive you want to check. The /f option fixes any errors found, and the /r option locates bad sectors and recovers readable information. Running this command may require administrative privileges and could take some time, depending on the size of the drive.