NewSID is a utility for changing the Computer Security Identifier (SID) of a Windows NT computer. Many organizations use disk image cloning to perform mass rollouts of Windows NT. This technique involves copying the disks of a fully installed and configured Windows NT computer onto the disk drives of other computers. These other computers effectively appear to have been through the same install process, and are immediately available for use. It has the major problem that every cloned system has an identical Computer Security Identifier (SID). This fact compromises security in Windows NT Workgroup environments, and removable media security can also be compromised in networks with multiple identical computer SIDs. NewSID is a utility for changing the SID name of a computer.