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•Record the full pre-alarm buffer in full when an event occurs: The option to write the pre-alarm buffer will cause the system to immediately write the pre-alarm buffer (instead of waiting for the queue), making it possible to send Playback Loop Event Actions at the time of occurrence of the alarm. If this option is disabled (Default), the system will write the pre-alarm buffer as new frames are received, not generating a spike in disk write data, but some features such as the Playback Loop Event Action can be compromised as the images may not have yet been written to the disk. With the option enabled, the system will write the entire buffer to the disk as soon as the event or movement occurs, which will generate a spike in data recording that can cause performance problems with the storage.