BNC 1420 - Video Microscope - Manual (Page 30)

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Setting of RAM and disk buffer size
The disk buffer is a contiguous area on the system disk set aside for
storing the video sequence in AVI format. The buffer settings dialogue
box allows you to specify the name and size of the disk buffer. Once the
disk buffer runs full during a recording session, the file system will start to
allocate extra disk space to hold the new data as is comes in. This will
considerably slow down the effective disk writing speed, resulting in
dropped frames. The larger the disk buffer, the longer the video sequence
without dropped frames.
6.4 Pre- and post trigger recording
The figure below illustrates the effect of the buffer size on the pre- and
post trigger recording durations.