Source:  FILESYS.NLM

Explanation:  This informational message indicates that the DISABLE TTS command was issued from the server's console.

This message is generated to the screen, and to the TTS$LOG.ERR file, just for a chronological record of when TTS was disabled, and to indicate that it was disabled by the operator rather than by TTS itself (as is the case when the TTS runs out of disk space).