On one of our installations, since installing TMWF9, whenever a USB drive (Hard disk or Flash media) is installed to the Master server, explorer stops responding for 10 minutes.

Remote access for file shares on servers still works. Sharepoint, Exchange and other services are unaffected. It is just the Explorer Windows on the local server console (Which is used for the Browse feature or File explorer /My Computer).

If you open the Disk Management before inserting the drive, you note that a volume comes up, then it all stalls and the disk is not allocated a drive letter for 10 minutes.

From a command prompt, if you try and move to that disk, it stalls. If you try a non existant disk, it comes back “drive not found”. In this way I know I can navigate using CMD and switch between drive letters to valid letters, just not this new volume.  It seems the drive has started allocating resouces but it is not yet available for use.

If during this time you try and stop the Trend Agent – real-time scan service, it hangs whilst stopping until the 10 minutes is up.

If we halt that service first, USB drives go in and out as normal. If we do not halt it or it restarts, when inserting a drive, Explorer hangs again for 10 minutes.

After 10 minutes, the drive volume appears, Explorer responds and everything goes back to normal.

There are no events recorded in the EventLog :(