"S" means sample verification which compare small portion of each files, "F" means full verification which compares all data of each file, while " " means no verification.
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Answer by barry2009-03-19
Richard: Chris is absolutely correct
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Answer by Richard Murai2009-03-28
Thanks guys. It took over a month to receive any response to my questions. So after using the 2700 during a recent one month project in Bhutan/SE Asia and wondering if the unit would work - which it did - with this level of on-line tech support (and extremely spotty in the USA - the distributor knows NOTHING about Nexto products) I would NEVER have purchased this unit. There are other alternatives that warrant consideration.