Source:  FILESYS.NLM

Possible Cause:  The system needs to allocate another directory block on the volume, but the volume is out of disk space. The system tries to allocate new directory blocks when a new directory is created or when a new file is added to an existing directory, but in this instance it did not have any entries left to track the new file.

Action:  See Resolving Server Disk Space Problems in the Server Operating System Administration Guide.