Hi Adam, The automount command line may apply to a new basic or dynamic volume when it is added to the system, and then assigns a drive letter to the volume. If you want to prevent a USB, please see: How can I prevent users from connecting to a USB storage device? http://support.microsoft.com/kb/823732 To simply prevent the SAN disk from presented online, set the san policy as disable by running: Diskpart SAN POLICY =OfflineAll See if this helps. Note: Please present a SAN disk (other than USB device) for test purpose. Thanks. Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Hi Adam, The automount command line may apply to a new basic or dynamic volume when it is added to the system, and then assigns a drive letter to the volume. If you want to prevent a USB, please see: How can I prevent users from connecting to a USB storage device? http://support.microsoft.com/kb/823732 To simply prevent the SAN disk from presented online, set the san policy as disable by running: Diskpart SAN POLICY =OfflineAll See if this helps. Note: Please present a SAN disk (other than USB device) for test purpose. Thanks. Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Hello, I'm trying to configure a backup server that is sharing the same LUNs as my ESX environment. I know it is good practice to disable automount when doing this however, when automount is disabled, it does not appear to work correctly. On my Windows 2008 R2 server i ran DISKPART>Automount>Scrub and Automount>disable. Rebooted the server Attached a USB flash drive (for testing before presenting SAN) Results: Flash drive mounts itself and windows assigns a drive letter I have also tried DISKPART>SAN=Offlineshared if this matters. Am I missing a step for disabling automount? I want the disk manager to see the drives in an unknown online state, i do not want drive letters or for any SAN disks to be attached. Thanks in advance!