Pioneer MJ-D508 User Manual download pdf (Page 9)

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About the Table of Contents

When you load any kind of nninidisc into the recorder, the

first thing it does is read a section of the disc called the

Table of Contents, or

TOC. Just as the contents page of a

book tells the reader what each chapter is about and

where to find it in the book, the TOC tells the recorder

where the tracks are on the disc, the name and length of

each track, the name of the disc, and so on. in the couple

of seconds it takes to read all this, the recorder's display

shows the message TOC Reading.

Since you can change what's on a recordable MD, the

Table of Contents is rewritable, and so is called the User

Table of Contents, or UTOC for short. If you have a

recordable disc loaded in the recorder and hit eject, the

recorder automatically updates the UTOC before giving you

the disc back. Alternatively, you can have the recorder

update the UTOC at any time using the UTOC write

function. In both cases, the message UTOC Writing

appears in the display during the UTOC updating process.

The UTOC is vital for the recorder to be able to play a disc

correctly. Until you hit eject or perform a UTOC write

command, the recorder stores all the current session's

recording and editing information in its memory. If there's a

power failure or you accidently switch the recorder off

before it's had a chance to write the UTOC there's a danger

that all that disc information will be lost. To prevent this,

switch the recorder back on as soon as possible and eject

the disc, if you leave the unit off for a week or more, the

information stored in the memory will be permanently lost

and the recordings/edits on that disc lost.

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About MD System Limitations

The sophisticated playback, editing and recording features

available to you with MD are possible because of the way

in which the sound data is stored on the disc together

with the system of TOCs and UTOCs described above.

There are times however when you might encounter odd

side-effects of the way the system works. These are not

malfunctions, but limitations of the system. Below is a list

of symptoms you may run across depending on the way

you record or edit discs.

Symptom

MD System Limitation

The recorder shows the message

TOC full even though there are fewer

than 255 tracks on the disc (the

maximum possible).

The recorder shows the message Disc

full before you've reached the maxi

mum recording time of the disc.

The amount of recording time available

doesn't increase after erasing some

short tracks.

The total recorded time, plus the

recording time remaining, appears to be

less than the length of the disc.

The recorder won't allow you to

combine two tracks into one during

editing.

The sound is interrupted during fast

forward or reverse.

Although when you listen to a disc it appears that each track sits end to end in an

unbroken sequence, the actual audio information may be scattered all over the disc in

different places. The more times you record and edit things on a disc, the more

scattered the information becomes. Usually, this doesn't affect the user; the recorder

keeps track of everything using the UTOC. However, because the recorder needs to

know where every little gap is on the disc (and counts each one as a track, although

you don't see it), the UTOC eventually fills up, and the recorder won't let you record

anything else on that disc. Erasing a complete track, or the entire disc cures the

problem.

If a disc is scratched or damaged in some way, that part of the disc becomes auto

matically unavailable for recording. In this case, the recorder shows the reduced

recording time available.

If you erase a track which is less than 12 seconds long, the recorder can't add that

time to the available recording time.

Recording time on a disc is divided into two second blocks—^the smallest 'unit' of a

minidisc. Although a piece of audio data may be shorter than this, it still takes up two

seconds on the disc, and the remainder is 'lost' (until the whole block is erased). As

the number of these partially used blocks builds up, you might notice that the total

disc length appears to shorten. (See also the note about damaged discs above.)

There are two situations where you can't use the combine edit feature:

❖ When one of the tracks was recorded using the digital input, and the other using

the analog input.

❖ When one track was recorded in long-play mono mode, and the other in normal

stereo mode.

As we mentioned above, the more re-recording and editing you do on a disc, the

more scattered the audio information on the disc becomes. During fast forward or

reverse this may show up as interrupted sound.

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Pioneer MJ-D508 User Manual Page 9

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