Sony MZ-R90/R91 System limitations, Cause, 45-GB, Symptom

System limitations

The recording system in your MiniDisc recorder is radically different from those used in cassette and DAT decks and is characterized by the limitations described below. Note, however, that these limitations are due to the inherent nature of the MD recording system itself and not to mechanical causes.

Symptom	Cause
“TR FULL” appears	When 254 tracks have been recorded on the disc, “TR FULL”
even before the disc	appears regardless of the total recorded time. More than 254
has reached the	tracks cannot be recorded on the disc. To continue recording,
maximum recording	erase unnecessary tracks.
time (60, 74, or 80
minutes).
“TR FULL” appears	Repeated recording and erasing may cause fragmentation and
even before the disc	scattering of data. Although those scattered data can be read,
has reached the	each fragment is counted as a track. In this case, the number of
maximum track	tracks may reach 254 and further recording is not possible. To
number or recording	continue recording, erase unnecessary tracks.
time.
Track marks cannot be	When the data of a track is fragmented, the track mark of a
erased.	fragment under 12 seconds long cannot be erased. You cannot
The remaining	combine a track recorded in stereo and a track recorded in
recording time does	monaural; nor can you combine a track recorded with digital
not increase even after	connection and a track recorded with analog connection.
erasing numerous short	Tracks of under 12 seconds in length are not counted and so
tracks.	erasing them may not lead to an increase in the recording time.
The total recorded time	Normally, recording is done in minimum units of approximately
and the remaining time	2 seconds. When recording is stopped, the last unit of recording
on the disc may not	always uses this unit of 2 seconds even if the actual recording is
total the maximum	shorter. Likewise, when recording is restarted after the stop, the
recording time (60, 74,	recorder will automatically insert a blank space amounting to 2
or 80 minutes).	seconds before the next recording. (This is to prevent accidental
	erasing of a previous track whenever a new recording is started).
	Therefore, the actual recording time will decrease whenever a
	recording is stopped; a maximum of 6 seconds compared to the
	potential recording time for each stop.
The edited tracks may	The fragmentation of data may cause sound dropout while
exhibit sound dropout	searching because the tracks are played in higher speed than
during search	normal playback.
operations.

45-GB