User's Manual

AD Plus2.0 User Manual
Page 35 of 66
2.7.2.1 General Settings
In this module, you can specify the system mode, overwrite function, lock duration,
pre-recording, SD record mode, and privacy channel configuration.
Tap Preferences > Surveillance > Record > General, as shown in the following
figure:
1. System: PAL and NTSC are available.
Note: This setting must be consistent with the video source system.
2. Overwrite: You can select By Capacity, By Day, or Never.
Note: Locked recording is overwritten only after its locking duration expires.
By Capacity is selected by default. In this case:
1) The SD card is overwritten by capacity. When the SD card storage space
is less than 2 GB, overwriting starts, with files of 128 MB deleted each
time.
2) The deletion proceeds by channel number and deletes 250 MB files from
each channel in one deletion. If one channel has a section less than 100
MB, the system moves to the next channel with longer duration.
By Day:
1) Files are overwritten by configured days, which range from 1 day to 31 days.
2) If 1 day is configured, the recording is saved for 1 day. If 31 days are
configured, the recording is overwritten after having being saved for 31 days.
3) 31-day storage duration is only possible when the disk has sufficient space. If
you have set a 31-day duration but the recording is only available for 7 days,
earlier recordings will be overwritten immediately after the SD card is full.
Never: Overwriting is not enabled for main stream recording, mirror stream,
sub-stream, and alarm stream. Recording stops after the memory is full.
3. Lock Duration:
Specifies the day(s) that locked recordings are retained. This setting prevents them
from being deleted earlier than expected. It is set to 7 days by default.
For details about how to lock recording, see Section 2.9.
4. Pre-recording