Event Details

Product: Microsoft Windows Operating System
Event ID: 307
Source: StorageSpaces-Driver
Version: Windows Server 2016, Windows Server 2012 R2, Windows Server 2012; Windows 10, Windows 8.1, Windows 8
Level: Error
Message: The attempt to unmap or trim the storage space %1 has failed. Return Code: %2


This topic describes how to troubleshoot storage space trim failures in a Storage Spaces storage pool.


The attempt to unmap or trim the listed storage space has failed.


To resolve the problem:

  • If there are missing drives, reconnect the missing drives.
  • Verify physical drives are functional. Replace failed physical drives if necessary.