Software⏱️ 3 min read📅 2026-06-19

How to Fix: Random IO error with NAS

Random IO error on NAS with file not found errors and temporary fixes.

Quick Answer: Check for firmware updates, disk health, and ensure proper network connectivity.

📋 Table of Contents

  1. 🔍 Why This Happens
  2. 🛠️ Step-by-Step Verified Fixes
  3. 💡 Conclusion

We are experiencing random IO errors with our Synology NAS (DiskStation Manager) that is affecting multiple workstations running Windows 7 64 bits and Windows 8 64 bits. The error occurs in various programs, resulting in 'file not found' or 'IO error' messages. Notably, when we open the affected file in Windows Explorer, it resolves temporarily.

This issue can be frustrating for our users as it hinders their productivity and requires manual intervention to resolve. In this troubleshooting guide, we will explore potential root causes and provide steps to fix the random IO errors on our NAS.

🔍 Why This Happens

  • The primary cause of these random IO errors is likely related to a misconfigured or unstable connection between the NAS and the workstations. This can be due to various factors such as outdated network drivers, incorrect DNS settings, or issues with the NAS's file system.
  • Another possible reason could be a conflict between the NAS's time synchronization settings and the workstations' clocks. If the NAS is configured to use an external time source, it may cause issues if the workstations' clocks are not synchronized correctly.

🛠️ Step-by-Step Verified Fixes

Optimizing Network Settings

  1. Step 1: Step 1: Check and update the network drivers on all workstations to ensure they are using the latest versions. This can be done through the Device Manager or by downloading the latest drivers from the manufacturer's website.
  2. Step 2: Step 2: Verify that the DNS settings on both the NAS and the workstations are correct and consistent. You can do this by checking the DNS configuration on the NAS and ensuring it matches the settings on each workstation.
  3. Step 3: Step 3: Ensure that the time synchronization settings on the NAS are configured correctly, and all workstations' clocks are synchronized with the NAS's clock. This can be done through the DSM's Time Synchronization settings.

Configuring Time Synchronization

  1. Step 1: Step 1: Configure the NAS to use an internal time source, such as NTP (Network Time Protocol), instead of an external time source. This can be done through the DSM's Time Settings.
  2. Step 2: Step 2: Ensure that all workstations are configured to synchronize their clocks with the NAS's clock using NTP. You can do this by checking the workstations' Date and Time settings.

💡 Conclusion

By following these steps, you should be able to resolve the random IO errors on your Synology NAS. If the issue persists after trying these methods, it may be worth investigating further into the NAS's file system or network configuration for any potential issues.

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