trying to data log to sd every millisecond and having problems

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6

I made a simpler code

Post the code, using code tags.

What is your thinking here? Do you not realize that the integer divide will always give 0 as a result?

 val = analogRead(A0);
  volts = (val/1040);

Most people use statements similar to these:

 val = analogRead(A0);
 float volts = 5.0*val/1024.;