FOCUS Enhancements 3.2 - Manual (Page 112)

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Reserves MBs
Allows you to allocate a fixed amount of Firefly’s internal storage
space for receiving a multicast update. To determine this value,
you will need to estimate the largest multicast update you will ever
receive (example: 1000 MBs). Then, double that amount (example:
1000 MBs x 2 = 2000 MBs) to allow room for both the
compressed archive and the extraction process. Once you have
determined this value, enter it for the Reserve MBs.
Delete Channel
Quickly defaults back to blank “Listen” fields for the chosen
deleted Channel.