What does Windows error code 649 (ERROR_MOUNT_POINT_NOT_RESOLVED) mean?

 
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ERROR_DEVICE_ENUMERATION_ERROR ERROR_INVALID_DEVICE_OBJECT_PARAMETER

ERROR_MOUNT_POINT_NOT_RESOLVED

What ERROR_MOUNT_POINT_NOT_RESOLVED means

The namespace says the path continues on another volume, but the device object used for the create operation cannot correctly reach that target. This indicates a storage namespace or filter-stack mismatch.

Where it appears

  • volume mount points and junction-based storage layouts
  • file-system filter drivers issuing related opens
  • backup, antivirus, and virtualization storage components

Likely causes

  • stale mount-point metadata
  • volume offline, removed, or remounted
  • filter driver using the wrong related device object
  • race during volume arrival or teardown

What to collect

  1. full path and resolved volume GUID path
  2. mountvol output and volume online state
  3. filter-manager stack for source and target volumes
  4. storage and FilterManager events around the failure

How to respond

Refresh mount-point configuration and ensure the target volume is online. Filter drivers must reissue the operation against the correct target volume rather than bypassing attachment checks. Remove stale mount points only after confirming they no longer represent valid data.

References


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