operations cannot be performed on the master database:

• Adding files or filegroups.

• Changing collation. The default collation is the server collation.

• Changing the database owner. master is owned by sa.

• Creating a full-text catalog or full-text index.

• Creating triggers on system tables in the database.

• Dropping the database.

• Dropping the guest user from the database.

• Enabling change data capture.

• Participating in database mirroring.

• Removing the primary filegroup, primary data file, or log file.

• Renaming the database or primary filegroup.

• Setting the database to OFFLINE.

• Setting the database or primary filegroup to READ_ONLY.