I like the "channel per column" approach where each line represents a
particular sample time. As the data is captured, you can write it
sequentially. I do a fair amount of logging of data to flash in fixed
record sizes. The first 4 bytes are the Unix time stamp. Then various
fields, some binary, some fixed length text, are defined. The record
length is a multiple of 2 so you can easily calculate where record N
starts and where each element in that record is. These are all translated
directly to addresses in SPI flash. The log write is just a bunch of
sequential writes. Log read is similarly a bunch of sequential reads.

Harold




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