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You can map devices names, users and groups found on a mounted CD-ROM filesystem to entities found on the system. For example, by default the system assigns unknown user or group IDs on a mounted CD-ROM to user nobody.
To set the default user or group ID, select the CD-ROM filesystem
in the Filesystem Manager and select
Mount  Modify Mount Configuration
 Modify Mount Configuration  Set more options.
Enter or select a Default User or
Default Group.
 Set more options.
Enter or select a Default User or
Default Group.
To map specific entities (including device names), select the appropriate Mapping button. Enter a filename for the mapping file, or use the Browse button to select an existing file: