Sony ICD-P520 Operating Instructions Manual page 16

Remaining memory indication
During recording, the remaining memory
indicator decreases one by one.
The memory is
nearly full.
When the remaining time of recording
reaches 5 minutes, the last one of the
indication flashes.
If the remaining recording time display
mode is selected, the remaining
recording time display will also flash
when the remaining time reaches 1
minute.
When the memory is full, recording
automatically stops and "FULL" will flash
in the display window with an alarm
sound. To continue recording, first erase
some of the messages.
1
GB
Flashing

Notes
If you press  REC/PAUSE when the

memory is full, "FULL" will flash with an alarm
sound. Erase some of the messages before
you start recording again.
If you press  REC/PAUSE after you have

recorded 99 messages, "FULL" will flash with
an alarm sound. Select another folder or
erase some of the messages.