What can cause read errors in SMART logs?

• A. Media wear, failing heads, vibration, shock, or electrical issues.
• B. Software bugs in the operating system
• C. Low disk temperature
• D. Bad antivirus scans

Answer: (A)

Read errors in SMART logs point to hardware-related problems with the drive or its operating environment. Over time, wear of the magnetic media can make sectors unreadable. The read/write heads themselves can degrade or fail, reducing the drive’s ability to read data accurately. Mechanical factors like vibration or a shock can momentarily misalign the heads or disturb reads, leading to errors. Electrical issues—power fluctuations, voltage irregularities, or controller faults—can corrupt the read signal and cause read errors to be logged. These are hardware conditions the drive’s firmware monitors, which is why SMART flags them. Software problems in the operating system or antivirus tools don’t produce SMART read errors, and while extreme temperatures can affect reliability, they’re not the direct typical cause of the read errors SMART records.