Swann DVR4-2000 Operating Instructions Manual page 19

Audio
The audio recording function can be turned enabled or disabled here. If you have
no audio recording equipment (such as a microphone) attached to your system or
simply do not want to record sound, then we suggest disabling the audio here - it
will save a small but noticeable amount of hard drive space.
Rec. Mode (Recording Mode)
There are two recording methods which can be chosen here, the choices are
ALWAYS or TIME SCHEDULE RECORDING.
If you want the DVR to record
constantly then choose ALWAYS. On
the other hand, if you want the DVR
to either record at specific times, or
when motion is detected during the
pre-defined times, then choose TIME
SCHEDULE RECORD. When you select
the latter, a SCHEDULE button will
appear, allowing you to program a
custom recording schedule.
Chunk Size
Chunk Size is a measurement of how long the DVR will record for before splitting
the output file into discrete units. Chunks are something like the scene numbers
on a DVD - though the video is broken up into separate units, it will still play
through as one continuous movie (unless interrupted by the schedule or motion
detection turning the recording on or off).
The right settings for you depend on a number of factors. Larger Chunk Sizes
use slightly less space on the HDD and keep related events together. Also, larger
Chunk Sizes make navigating through the File List a bit easier (see page 24).
Smaller Chunk Sizes are more resistant to file corruption, and make backing up
slightly quicker. If you don't want to worry about setting Chunk Size, you can leave
it on the default value; it will make little difference to the day-to-day running of
the DVR.
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Remember: After making changes to the settings press/click the APPLY button.