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Ultra compact size made possible by ATRAC*
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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.
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ATRAC: An abbreviation of Adaptive Transform Acoustic Coding
Quick random access
One of the great features fo 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 fro 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 to 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 to 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, it 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 the maximum recordable time
of the disc (60-minute or 74-minute)
Recording is performed in a 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 disc, the available time becomes even shorter, because the sections which are scratched are
automatically erased.
Track numbers may not be registered properly
When recording from a CD with 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 be acceptable
When digital recording is attempted form 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 digital audio
systems thus protecting copyrights.