What does the SID mean when it appears in radiology equipment?

SID is a unique identification number. Used to identify a user. It exists in the local SAM database. By default, this database is not even readable by administrators. Only SYSTEM has full control. Let's say we can modify the administrator's account. That modified before and after the modification of the system how to identify you still is not the administrator? In fact, it is to see the SID number. So the SID will never be repeated. Even if you reinstall part of the SID number is still not the same. The system after 2000/XP is more dependent on SID. Obviously for the registry, NTFS, EFS (encrypted files), etc. all rely on the SID. A simple GHOST only copies the SIDs of the system, but not the SIDs of the other partitions that may have been recorded. So the recovery may cause access failure. With SYSPREP, you can clear the SID number from the system. The system will automatically regenerate it after recovery. The SAM library can be opened in XP like this: REGEDIT HKEY_LOCAL_MACHINE\SAM\SAM At this time you can not see anything. Give yourself permissions as you did last time. Right click Permissions. Give the Administrators group FULL CONTROL to see the SID and other information. the SID is very long. For example: S-1-5-21-1177238915-1767777339-839522115