What Is An Md - Sony MZ-R55 Operating Instructions Manual

Optional accessories
Optical Cable
POC-151HG, POC-152HG, POC-MZ1,
POC-MZ2, POC-15B, POC-15AB, POC-
DA12SP
Line Cable RK-G129, RK-G136
Stereo Microphones ECM-717, ECM-MS907,
ECM-MS957
Stereo Headphones* MDR-D77, MDR-D55
Active Speakers SRS-A41, SRS-A91
Recordable MDs MDW-series
MiniDisc Carrying Case CK-MD4
MiniDisc Filing Box CK-MD10
Your dealer may not handle some of the
above listed accessories. Please ask the
dealer for detailed information about the
accessories in your country.
US and foreign patents licensed from Dolby
Laboratories Licensing Corporation.
Design and specifications are subject to
change without notice.
* Whether you should plug the headphones
directly to 2/REMOTE on the main unit or
to a remote control, use only headphones
with stereo mini plugs.
stereo mini plugs

What is an MD?

How MiniDisc works
MiniDisc (MD) comes in two types:
premastered (prerecorded) and
recordable (blank). Premastered MDs,
recorded at music studios, can be played
back almost endlessly. However, they
can't be recorded on or over like cassette
tapes. To record, you must use a
"recordable MD".
Premastered MDs
Premastered MDs are recorded and
played like regular CDs. A laser beam
focuses on the pits in the surface of the
MD and reflects the information back to
the lens in the recorder. The recorder then
decodes the signals and plays them back
as music.
Recordable MDs
Recordable MDs, which use magneto-
optical (MO) technology, can be recorded
again and again. The laser inside the
recorder applies heat to the MD,
demagnetizing the magnetic layer of the
MD. The recorder then applies a magnetic
field to the layer. This magnetic field
corresponds exactly to the audio signals
generated by the connected source. (The
north and south polarities equate to
digital "1" and "0".) The demagnetized
MD adopts the polarity of the magnetic
field, resulting in a recorded MD.
37-
GB