What is Reallocated_Sector_Ct (ID 5)?

• A. Unreadable sectors waiting for remap
• B. Drive deterioration caused by media issues
• C. Progressive failure trend
• D. Count of bad sectors remapped to spare area

Answer: (D)

Reallocated_Sector_Ct is a tally of sectors that the drive has found defective and remapped to spare storage. When the hard drive detects a bad sector during write or read operations, it copies the data to a reserve spare sector and updates the internal mapping, which increases this count. That makes it a direct indicator of how many sectors have needed replacement due to media issues. A rising number signals growing media wear and potential imminent failure, so backing up data and planning a replacement is wise if the value increases or climbs steadily. The other options describe different SMART indicators or phenomena: unreadable sectors waiting for remap refer to sectors in a pending state that may or may not be remapped later, “drive deterioration caused by media issues” is a general description rather than a specific SMART counter, and a progressive failure trend isn’t a defined SMART metric. The practical takeaway is that this attribute specifically tracks how many sectors have been remapped to spare area.