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WHAT IS AN MD (MINI DISC)?
An MD is only 64 mm (2
5/8
in.) in diameter,
about half the size of
a conventional
CD. But an MD can be used to store and playback
a full 74 minutes of data such as a CD. Unlike a CD, MD comes
in a plastic cartridge,
so that it can be handled
with ease. The
cartridge
also protects
the disc inside from shocks,
dust and
scratches.
Unlike cassette
tapes, which can become
stretched
or tangled,
an MD is an excellent
durable
media.
TYPES OF MDS
There are two types of MDs: "Optical discs" and "Magneto-optical
discs".
Both
types
use
laser
beams
and
optical
pick-up
technology
to read recorded
data during playback.
Optical
discs
These
are playback
only discs.
Like CDs, they are used as
prerecorded
music discs.
You cannot
record or edit them.
n t
Label
Recordable
MO*l
discs
The shutter covers
the opening
only on
the non-labeled
side of the MD.
These
are recordable
discs which
can be recorded
on again
and again,
like cassette
tapes.
The recording
method
called
magneto-optical
technology
employs
a laser and magnetism
to
record signals.
Therefore,
the quality
of recorded
sound does
not deteriorate
even after many playbacks
and recordings,
4
m
El+
Label
The shutter covers
the opening
on both
sides of the MD.
*' MO: An abbreviation
of Magneto
Optical
Ultra compact size made possible by ATRAC*2
technology
A newly developed
digital audio compression
technology
called
the ATRAC
system
automatically
extracts
only the frequencies
that
are actually
audible
to the
human
ear and cuts
the
frequencies
which are inaudible.
This compresses
the amount
of data to be recorded
to 1/5 of the normal amount. The ATRAC
system is based upon studies carried out in the field of auditory
psychology
and does not impair the quality of the audible sound.
*2 ATRAC:
An abbreviation
of Adaptive
TRansform
Acoustic
Coding
Quick random access
One of the great features
of the MD is that you can search for
desired tracks quickly. There are also quick and easy functions
for random
playback,
in which the order of the tracks
can be
rearranged
at random, and for renumbering
tracks enabling them
to be played in any order.
THE LIMITATIONS OF MD
Recording
on the MD is performed
differently
from that of a
cassette
tape or a DAT. Therefore,
the MD system
is subject to
the following
restrictions.
"TOC*
Full"
is displayed
even
if the recording
time
does
not reach
the maximum
recordable
time
of the
disc
(60-minute
or 74-minute).
"TOC Full" is displayed
when 254 tracks are already
recorded
on a disc, without
respect of the recording
time.
*TOC: An abbreviation
of Table Of Contents,
"TOC
Full" is displayed
even
if a disc
is not fully
recorded
on.
If there are lots of emphasis
data in a particular
track, the unit
handles
the data as index codes,
and tracks
are counted,
in
addition,
without
respect of the time and number of tracks.
The remaining time on a disc is not increased even
after some short tracks have been erased.
When the remaining
time on a disc is displayed,
which may not
be increased even after erasing short tracks because the sections
less than eight seconds
are not counted.
Tracks cannot be joined (the COMBINE function does
not function).
Tracks created
by editing may not be joined.
The total of the recorded time and the remaining time
on a disc does not match with the maximum
recordable time of the disc (60-minute or 74-minute).
Recording
is performed
by the minimum
unit of one cluster (two
seconds).
Even
if the recorded
section
is shorter
than two
seconds,
a two-second
space is needed in recording.
Therefore,
the available
time becomes
shorter.
If there are scratches
on a
M
disc, the available
time becomes
shorter
as well, because
the
sections
which are scratched
are automatically
erased.
Track numbers may not be registered
properly.
When recording
from a CD through
digital inputs (using the CD
*
MD button),
small tracks may be created
depending
on the
contents
of a CD.
When using the AUTO MARK function,
track numbers
may not
be registered
properly
depending
on the contents
of the CD.
Digital inputs may not be acceptable.
When digital recording
is attempted
from recorded
material with
copyrights,
digital dubbing cannot be performed
to a recordable
MD from another
MD recorded
in digital, because
of the built-in
record
restriction
function
which
complies
with the SCMS*
standard.
* SCMS (Serial Copy Management
System)
is the standard
to
restrict single digital dubbing
between the digital audio system
thus protecting
copyrights.
(prerecorded"s%und
source)
Digital
dubbing
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FE9
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