You can change a partition's security identifier (SID). A SID is a unique name that identifies a subject, such as a user or a group of users in a computer network. Every Windows partition must have a unique SID. If you copy a partition, update the SID so the computer can recognize the new partition.
To change the security identifier:
1 In the disk map, click the partition to select it.
2 To change the SID for all drives and partitions, from the Advanced menu, choose Change SID > All Drives and Partitions.
3 To change the SID only for the partitions on the selected drive, from the Advanced menu, choose Change SID > All Partitions on this Drive.
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