I was able to recreate the issue of multiple SD card image files being
created with only *one *click of the Create SD Card image.  I removed
pigz.tcz and then accessed pCP via my iPad.  

1. I clicked "create" button and I see "Writing -2028mb image" and I see
a series of dots that appear which I assume shows progress is
occurring.
2. I wait and the iPad screen turns off due to inactivity after a
minute.
3. After a while, I press the home button to wake up the iPad.
4. The Safari page instead of showing pCP and the status display, I see
the message "Safari cannot open the page because the network connection
was lost."  
I am not sure why it would say that as I have good Wifi signal as the
access point is in the same room.  I never get this message when the
main pCP page, LMS pages are displayed and the iPad comes back from
standby.
5. I tap refresh; the symbol with the circle with a clockwise arrow in
Safari.
6. The pCP page reappears showing the status with "Writing -2028mb
image"
However, I notice the dots have started over.  In other words, I do not
that additional progress has occurred since the screen went into
standby.
7. This time I touch the screen every ~30 seconds so it will not go into
standby.
I see the dots appear across the screen. The process takes 15 minutes. 
When it is complete I see pCP displaying information of 2 partitions,
the size of each partition, LBA start, LBA end.  The disk size says
30528 mb.
8.  Using my Windows 10 computer I go to the directory where the images
are stored and I see 2 new files with the same size.   Yet I clicked on
the "create" button only once.  The time stamp on each file is 3 minutes
apart. 

The only thing I makes sense to me, is that when I taped on the refresh
symbol it resulted in another backup process.  Perhaps in parallel?  

I hope this helps if the creators are concerned about this.  The process
does appear to work, it is just not what I expected.  (However, I have
not validated the images by putting them on a second card and then using
it to boot-up the 3B+.)

The other observation is pigz.tcz really speeds up the process; took
less than 5 minutes.

If you need more information, please let me know.  

Thanks to all the people that develop, maintain, and help people with
pCP!! 

Paul


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