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Cream of the Crop 21
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Cream of the Crop 21 (Terry Blount) (October 1996).iso
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1996-09-14
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HOW TO CREATE A SINGLE-SESSION "CD PLUS" TYPE DISC
--------------------------------------------------
A "CD Plus" disc (also known as "CD Extra"), is a disc that contains
both data and audio tracks. It is similar to a mixed-mode disc except
that the data track is hidden in such a way that a normal audio CD
player will not see it, but a computer CDROM drive will. The new
"CD Plus" standard specifies that these type of discs be written in
multiple sessions (with audio in the first session and data in the
second), but there is an easier way to make this type of disc in a
single session. This method is very popular and continues to be
used by the CDROM industry.
WARNING: Some CD recorders will not allow you to make this type of
disc because they restrict the length of the first track's pregap
to three seconds in length. Also, some CDROM drives will not properly
read these discs.
The "trick" is to hide the data track in the pregap (INDEX 0) of the
first audio track so that a normal audio CD player will not see it,
but a computer CDROM drive will.
STEP 1 - Create an ISO9660 image of the data that you wish to hide.
You can use MAKEISO.EXE or any Windows based ISO9660 image
builder.
STEP 2 - Convert the ISO9660 image file to RAW sector format using
the ISO2RAW.EXE utility. You *must* use both the /POSTGAP
and /SCRAMBLE options!
STEP 3 - Get a directory listing of the RAW data file and divide the
file's length by 2352 to determine the number of frames the
data will occupy on the disc (if you didn't get a whole number,
then you did something wrong). Convert this number to minutes,
seconds, and frames (at 75 frames per second).
STEP 4 - This is where it gets a little tricky... Since you are
writing the data into the pregap of the first audio track,
you have to fool everything into thinking that the data is
really audio. This means that you must attach the raw data
onto the beginning of the first audio file. Presently, there
is no utility to do this, so you're on your own. If the first
audio track is in a WAV file, then you will have to figure
out how to attach the raw data and properly update the WAV
file header fields. If your audio data is in a straight
binary file, then this task is a little easier because you
don't have to deal with updating the WAV file header.
STEP 5 - Write the CUE SHEET (this is just an example)...
FILE TRACK1.WAV AUDIO 2352
TRACK 01
INDEX 00 00:00:00 (data track is hidden here)
INDEX 01 MM:SS:FF (numbers calculated in Step 3).
FILE TRACK2.WAV AUDIO 2352
TRACK 02
INDEX 00 00:00:00
FILE TRACK3.WAV AUDIO 2352
TRACK 03
INDEX 00 00:00:00
STEP 6 - Use DAO.EXE to record the new disc. If you are using binary
audio files instead of WAV files, then make sure that you
use the /BIN option.