CDFS(4) CDFS(4)
NAME
cdfs - CD reader and writer file system
SYNOPSIS
cdfs [ -d sddev ] [ -m mtpt ]
DESCRIPTION
Cdfs serves a one and a half level directory mounted at mtpt
(default /mnt/cd) that provides access to the tracks on CDs
placed in the CD reader or writer named by sddev (default
/dev/sdD0, see sd(3)).
The top level directory contains one file per CD track. The
files are named cNNN, where c is a type character (a for
audio tracks and d for data tracks) and NNN is the track
number.
If the device is capable of writing CDs and contains a writ-
able CD, the top level directory also contains two empty
directories wa and wd. Files created in these directories
appear in the top level directory as new audio or data
tracks, regardless of name.
At any time, any number of tracks may be open for reading or
a single track may be open for writing. Writing a CD track
is a real-time operation: the CD writer must be kept satu-
rated with new data to avoid buffer underruns. To ensure
this, copying from a file system stored on local disk is
recommended.
To fixate a CD (close a writable CD by writing its permanent
table of contents), simply remove the wa or wd directory.
The directory removed selects whether the CD is fixated as
an audio or data CD; since each track carries its own type
information, very few readers care which fixation type was
used.
The top level directory also contains a ctl file, into which
control messages may be echoed. The current control mes-
sages are:
blank Blank the entire rewritable CD in the drive.
quickblank Blank only the table of contents on the rewrit-
able CD in the drive.
eject Eject the CD in the drive.
ingest Ingest a CD into the drive.
Only MMC-compliant CD readers and writers are supported, but
it would be easy to add support for early CD writers if
desired.
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CDFS(4) CDFS(4)
EXAMPLE
Copy the audio tracks from a CD:
cdfs -d /dev/sd05
mkdir /tmp/songs
cp /mnt/cd/a* /tmp/songs
Copy the tracks onto a blank CD inserted in the drive, and
then fixate the disk as an audio CD.
cp /tmp/songs/* /mnt/cd/wa
rm /mnt/cd/wa
Cut your own 9660 CD-ROM, without spooling the CD image to a
temporary file.
disk/mk9660 -9cj -n notice cdproto >/mnt/cd/wd/foo
rm /mnt/cd/wd
SOURCE
/sys/src/cmd/cdfs
SEE ALSO
sd(3), 9660srv (in dossrv(4)), mk9660(8)
BUGS
There should be support for DVDs.
Page 2 Plan 9 (printed 11/26/24)