Timestamping AnalogBinLogger data
The straightforward solution:

const size_t DATA_DIM16 = 84;
struct block16_t {
  unsigned short count;    // count of data values
  unsigned short overrun;  // count of overruns since last block
  unsigned short data[DATA_DIM16];
  unsigned long  milli[DATA_DIM16]; // time in milliseconds
  unsigned long padding;   // pad to 512 bytes
};


Now, I suggest to think again about your requirements. Do you really
need a 32-bit timestamp for every data point? If they are closely spaced
in time, a 16-bit, or even 8-bit timestamp should be enough. You could
put a full 32-bit timestamp at the beginning of each block, then only
8-bit timestamps for every data point. This would allow you to store
168&nbsp;samples per block. You could even pack a 6-bit timestamp with
the data sample into an uint16_t, and have 252 samples per block.