Synology NAS Error Code 44: How to Fix USB Device Error

Easy 15-30 minutes Medium Severity Verified June 2026
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Error Code
44
Brand
Synology
Product Type
nas
Severity
Medium
DIY Difficulty
Easy
Estimated Fix Time
15-30 minutes
Error code 44 on your Synology NAS indicates that DSM has detected a problem with a USB device connected to your NAS. This could be caused by a faulty USB drive, a compatibility issue, or a corrupted file system. Follow these steps to identify and resolve the issue.
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Tools You'll Need

How to Fix Error Code 44

  1. Back Up Your Data

  2. Disconnect All USB Devices

  3. Reconnect USB Devices One at a Time

  4. Check USB Device Format

    Formatting will erase all data on the USB device.

  5. Run File System Check

  6. Test with a Different USB Port

  7. Update DSM and USB Drivers

    Restart the NAS after the update.

  8. Replace the USB Device

Parts You May Need

USB flash drive or external hard drive
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USB flash drive or external hard drive
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USB flash drive or external hard drive
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USB flash drive or external hard drive
Check Price on Amazon
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When to Call a Professional

If the error persists after trying all steps, or if you suspect a hardware issue with the NAS itself (e.g., faulty USB controller), contact Synology support or a professional IT technician.

Frequently Asked Questions

Can I ignore error code 44?
It's not recommended. The error indicates a problem with a USB device, which could lead to data corruption or loss if ignored.
Will a USB hub cause error code 44?
Possibly. Synology NAS devices may not support all USB hubs. Try connecting USB devices directly to the NAS ports.
Does error 44 affect NAS performance?
Usually no, but it may prevent access to the affected USB device. The NAS itself should continue to function normally.
How do I check USB device compatibility with Synology?
Visit Synology's compatibility list on their website or check the DSM help center for supported USB devices.
Can a UPS cause error code 44?
Yes, if the UPS is malfunctioning or its USB communication cable is faulty. Test without the UPS connected.

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