cdfs(4) 						     Kernel Interfaces Manual							   cdfs(4)

NAME

       cdfs - The Compact Disk-Read Only Memory File System (CDFS)

DESCRIPTION

       The  ISO  9660  standard  describes volume and file structures for information exchange on a Compact Disk-Read Only Memory (CD-ROM) volume.
       CDFS supports mounting, as another local file system type, CD-ROMs that comply  to  the	standard.  Once  mounted,  files  and  directories
       recorded  on  the  CD-ROM  become accessible in a read-only manner through system calls and commands. Support of the standard is limited to
       Interchange Level 2 with the exception of multiple volume semantics,  which  are  supported.   Refer  to  the  international  standard  ISO
       9660-1988 for additional information pertaining to the actual standard.

       The  CDFS behaves the same as any read-only file system, and additionally supports the following semantics: The CDFS can be exported by NFS
       Users can mount other file system types (UFS, NFS, AdvFS) onto directories recorded on a CD-ROM volume CD-ROM volumes can  be  recorded	in
       ISO  9660-1988,	Interchange  level  2,	or (for backward compatibility) High Sierra Group (HSG) format The data on a CD-ROM volume that is
       recorded as part of a multiple volume set or consists of a single volume is made available when the volume is mounted File systems on a CD-
       ROM  volume  can  be  accessed locally and remotely The CDFS can be organized on a CD-ROM volume in multiple sessions.  The contents of all
       sessions is available as one file system; individual sessions are not separately available.

       The CDFS also supports CD-ROMs recorded using the Rock Ridge Interchange Protocol, Revision 1.09, August 1991.  Rock  Ridge  specifies  the
       use  of	the  extension	fields	that are defined by ISO-9660:1988, and it uses those extensions to provide the following information: File
       owner, file group, file permissions Additional file types (symbolic links, device special files, named pipes) setuid,  setgid,  and  sticky
       bits  Hard  link  counts POSIX file names (mixed case names, unstructured names, and longer names than ISO-9660:1988 allows) Deep directory
       hierarchies (greater than 8 levels) File time stamps

       Refer to the Rock Ridge specification for additional information about the extensions.

       The CDFS also supports the XCDR extensions (X/Open Preliminary Specification (1991) CD-ROM Support Component).  These XCDR  extensions  add
       the following support: Users can examine selected ISO 9660 attributes through defined utilities and shared libraries A system administrator
       can substitute different file protections, owners, and file names for files on a CD-ROM volume.

RELATED INFORMATION

       mount(8), cddevsuppl(8), cdsuf(1), cd_getdevmap(3), cd_setdevmap(3), and cd_suf(3) delim off

																	   cdfs(4)