D-Link DCS-2000 Manual page 60

Scheduling Concept
Time Unit
Each time-line has its own basic marking unit, if you make your schedule
on different time-line from what was intended, the resulting schedule is
will be very different from what was intended.
Scheduling example:
Click on 10:00 from the Hour-time line.
The next time unit is 10:05
If you click the left mouse button on the Hour time-line as the time
information, 10:00, then the recording time is:
5 Minutes recording record within half-day
5 Minutes recording record
5 Minutes recording record within 20 Minutes
5 Minutes recording record within 1 Hour
60