Hidden Faults in Synology’s Diagnostic Tool
A seasoned NAS owner discovered a hidden flaw in Synology’s diagnostic tool after uncovering over nine thousand errors on a single hard drive. The oversight was revealed only when the user manually queried the drive’s SMART data, bypassing the automated health check.
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Google Adds Pixel 9 Series to Certified Refurbished StoreThe user, who has managed Synology systems for years, noticed that the DiskStation Manager (DSM) „Health Info” panel reported no issues on a Seagate IronWolf 4TB. However, a direct SMART read revealed 9,527 read errors, 1,200 reallocated sectors, and multiple pending sectors that the software had ignored. The discovery came after a routine backup failed, prompting a deeper investigation.
Why Manual Checks Still Matter – Even With Modern NAS
Synology’s built‑in health check scans a limited set of SMART attributes and applies conservative thresholds. The tool’s algorithm does not flag errors until a drive reaches a critical point, which can leave users unaware of early corruption. In this case, the drive’s „Current Pending Sector Count” rose steadily but never triggered an alert. The automated check only monitors a handful of health indicators, overlooking the subtle signs that the drive’s firmware reported.
The user’s manual approach involved running „smartctl -a” from the command line, which returned a comprehensive report. The data highlighted a growing number of read errors that could cascade into data loss if left unchecked. Synology’s support team confirmed that the issue was a known bug in DSM 7.2, affecting certain Seagate models. A firmware update later corrected the misinterpretation of SMART thresholds, but the damage had already been done.
Even as NAS devices become more automated, the article stresses that users should not rely solely on vendor tools. The author points out that manual diagnostics provide a fuller picture of drive health, especially for mission‑critical data. „Automated tools are convenient, but they can miss early warning signs,” the writer notes. By regularly running SMART checks or using third‑party software, users can catch problems before they lead to catastrophic failure.
Frequently Asked Questions
The article also highlights that the Synology community has reported similar experiences. Several forum posts described drives with high error counts that remained unflagged until users performed a manual scan. Synology’s response has been to recommend firmware updates and to encourage users to run SMART diagnostics periodically.
The consequence of this oversight is a potential increase in data loss incidents. Users who rely solely on the health check may overlook drives that are already deteriorating, leading to unexpected downtime. Synology’s patch addresses the immediate issue, but the broader lesson remains: vigilance and manual checks are essential safeguards.
