What is the best method to add data to a file stored on a usb flash drive to avoid too many write cycles?

Hello

I'm trying to store an important data on a cRIO sampled stream in the USB flash drive.

I believe that there are two ways to add data to a file:

1. open the file outside of the loop, then write to the file loop, then close the file outside the loop.

Pros; More quickly and efficiently than the opening and closing of files in a loop is resource heavy equipment.

Disadvantages; If the program fails partially through, all data is lost.

2. open the file, write to the file and close the file, all in the loop.

With the advantages and disadvantages as opposed to option 1.

As my cRIO is finally deployed in a hostile environment and data are valuable and processing speed is not an issue of concern in this project, I'm leaning towards option 2, but after a few basic calculations that I realize that I'll be writing/opening/closing the file of thousands of times and I wanted to know if this will wear out the flash memory?

My uncertainty is due to not understanding what happens when a file is opened written to and closed.  He writes the new data to new areas of the flash, or it write all data on top?  The latter would cause me problems not too long term!

Any help gratefully received.

A big thank you and best regards,

Ed

The 'magic' is not in the File Format (PDM vs vs binary text), but in the "life" of the file.  This solution creates a file of 24 hours and maintains a different file for each day.  If the USB "dies", you lose everything you have not backed up somewhere.  If the program dies (or errors), you lose the data for the current day.  You end up with multiple files (which can be a more or less), but we must still make the trade-off between (duration) of the file and the file number opens (which relates to your concern for the longevity of the USB).  By the way, I suspect that a good quality USB key (it's what you mean, right?  Or do you mean a hard drive USB powered?  Comments probably apply both) can predict today to not die on you, everything just because you make a lot of reads/writes (of course, you could get in-a-thousand...).

Bob Schor

Tags: NI Software

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