What does the SMART attribute Reallocated_Event_Count measure?

• A. Number of attempts to reallocate sectors.
• B. Time since last allocation.
• C. Count of copy operations.
• D. Number of sectors successfully reallocated.

Answer: (A)

Reallocated_Event_Count tracks how many times the drive has had to reallocate a sector due to a read/write error. Each time a bad sector is detected and the data is moved to a spare area, this counter goes up. It’s a measure of how often reallocation events occur, which reflects wear and potential reliability issues over time. It isn’t about how long since a sector was allocated, it isn’t a count of copy operations, and it doesn’t directly indicate how many sectors were successfully reallocated—the latter is tracked by a different SMART metric. A rising value signifies more bad sectors being encountered and remapped, signaling increasing stress on the drive.