Answer: The specific code that indicates a bad sector may vary depending on the manufacturer and model of the hard drive.
Explanation: However, a common code that is often reported by the S.M.A.R.T. system to indicate bad sectors is "UNC" or "Uncorrectable Sector Count." This code signifies that the hard drive has encountered a sector that cannot be read or written reliably, indicating a potential problem with the storage media.
Note that if you receive indications of bad sectors on your hard drive, it's advisable to back up your data and consider replacing or repairing the drive to avoid potential data loss or further damage.