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This indeed sounds like memory fragmentation.  You don't need to reload the
firmware.  Just go click on the brick in NXT-G  (top left choice of the
bottom right stuff that includes download and run), then select the memory
tab, then delete all, then reload the user programs you need on the brick
(and re-calibrate any sensors you have calibrated) and you should be good to
go.  You might want to load the least volatile programs first.

On Wed, Oct 19, 2011 at 5:45 PM, Andy Traiger <[log in to unmask]> wrote:

> Paul,
>
> I encountered this last year with one of our team's bricks.  I think as you
> add and delete programs the memory becomes fragmented and some of the
> memory
> becomes unavailable because it is not contiguous.  Last year when our NXT
> brick was reporting it had like 40K spare and it was not letting us
> download
> a ~20K file.  I reloaded the firmware (the same version that I was using).
> Use the Tools Menu --> Update NXT Firmware.  This erased all of our
> programs
> and files, but then it made more memory available; so there wasn't this
> missing chunk of memory that we couldn't write to anymore.  Has anyone else
> tried this and had success?
>
> Andy Traiger
> Vienna Robotics Coach
> Team 3070
>
> -----Original Message-----
> From: First Lego League in Virginia and DC
> [mailto:[log in to unmask]] On Behalf Of Bobby p. Carder
> Sent: Wednesday, October 19, 2011 4:40 PM
> To: [log in to unmask]
> Subject: [VADCFLL-L] Memory on the NXT brick
>
> Rookie coach here asking what is likely easy to answer.  Our team is
> getting
>
> out of memory (on the NXT brick) when they try to transfer programs to the
> brick.   We check the memory via the status function within the 2.0
> software
>
> and it read the brick only to tell us that there is still 50% unused
> capacity.
> We try it again...and na da.  The program isn't very big either.   Anyone
> ever
> seen this?  Thanks
>
> Paul Carder
> Team 342
> The Lost Marbles
>
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