In Windows Server 2003, Enterprise Edition, when you use the New Partition Wizard to format a partition on a new hard disk, AND you do NOT assign a drive letter or drive path, you may experience this behavior.
The subject behavior will occur if AutoMount is enabled on your computer.
When AutoMount is enabled, and a new hard disk is detected, Windows Server 2003 attempts to assign a drive letter and mount the disk.
To resolve this problem:
1. Copy / Paste the following to a NoAutoMount.reg file:
NOTE: In Windows Server 2003, Standard Edition, Automount is enabled by default, and the NoAutoMount Value Name is not present in the MountMgr sub-key. In Windows Server 2003, Enterprise Edition, the default behavior disables AutoMount by configuring the NoAutoMount with a data value of 1.
NOTE: You may have to restart your computer for this change to become effective.